freedom of speech

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Freedom of Speech

By: History.com Editors

Updated: July 27, 2023 | Original: December 4, 2017

Freedom of speech—the right to express opinions without government restraint—is a democratic ideal that dates back to ancient Greece. In the United States, the First Amendment guarantees free speech, though the United States, like all modern democracies, places limits on this freedom. In a series of landmark cases, the U.S. Supreme Court over the years has helped to define what types of speech are—and aren’t—protected under U.S. law.

The ancient Greeks pioneered free speech as a democratic principle. The ancient Greek word “parrhesia” means “free speech,” or “to speak candidly.” The term first appeared in Greek literature around the end of the fifth century B.C.

During the classical period, parrhesia became a fundamental part of the democracy of Athens. Leaders, philosophers, playwrights and everyday Athenians were free to openly discuss politics and religion and to criticize the government in some settings.

First Amendment

In the United States, the First Amendment protects freedom of speech.

The First Amendment was adopted on December 15, 1791 as part of the Bill of Rights—the first ten amendments to the United States Constitution . The Bill of Rights provides constitutional protection for certain individual liberties, including freedoms of speech, assembly and worship.

The First Amendment doesn’t specify what exactly is meant by freedom of speech. Defining what types of speech should and shouldn’t be protected by law has fallen largely to the courts.

In general, the First Amendment guarantees the right to express ideas and information. On a basic level, it means that people can express an opinion (even an unpopular or unsavory one) without fear of government censorship.

It protects all forms of communication, from speeches to art and other media.

Flag Burning

While freedom of speech pertains mostly to the spoken or written word, it also protects some forms of symbolic speech. Symbolic speech is an action that expresses an idea.

Flag burning is an example of symbolic speech that is protected under the First Amendment. Gregory Lee Johnson, a youth communist, burned a flag during the 1984 Republican National Convention in Dallas, Texas to protest the Reagan administration.

The U.S. Supreme Court , in 1990, reversed a Texas court’s conviction that Johnson broke the law by desecrating the flag. Texas v. Johnson invalidated statutes in Texas and 47 other states prohibiting flag burning.

When Isn’t Speech Protected?

Not all speech is protected under the First Amendment.

Forms of speech that aren’t protected include:

• Obscene material such as child pornography
• Plagiarism of copyrighted material
• Defamation (libel and slander)
• True threats

Speech inciting illegal actions or soliciting others to commit crimes aren’t protected under the First Amendment, either.

The Supreme Court decided a series of cases in 1919 that helped to define the limitations of free speech. Congress passed the Espionage Act of 1917, shortly after the United States entered into World War I . The law prohibited interference in military operations or recruitment.

Socialist Party activist Charles Schenck was arrested under the Espionage Act after he distributed fliers urging young men to dodge the draft. The Supreme Court upheld his conviction by creating the “clear and present danger” standard, explaining when the government is allowed to limit free speech. In this case, they viewed draft resistant as dangerous to national security.

American labor leader and Socialist Party activist Eugene Debs also was arrested under the Espionage Act after giving a speech in 1918 encouraging others not to join the military. Debs argued that he was exercising his right to free speech and that the Espionage Act of 1917 was unconstitutional. In Debs v. United States the U.S. Supreme Court upheld the constitutionality of the Espionage Act.

Freedom of Expression

The Supreme Court has interpreted artistic freedom broadly as a form of free speech.

In most cases, freedom of expression may be restricted only if it will cause direct and imminent harm. Shouting “fire!” in a crowded theater and causing a stampede would be an example of direct and imminent harm.

In deciding cases involving artistic freedom of expression the Supreme Court leans on a principle called “content neutrality.” Content neutrality means the government can’t censor or restrict expression just because some segment of the population finds the content offensive.

Free Speech in Schools

In 1965, students at a public high school in Des Moines, Iowa , organized a silent protest against the Vietnam War by wearing black armbands to protest the fighting. The students were suspended from school. The principal argued that the armbands were a distraction and could possibly lead to danger for the students.

The Supreme Court didn’t bite—they ruled in favor of the students’ right to wear the armbands as a form of free speech in Tinker v. Des Moines Independent School District . The case set the standard for free speech in schools. However, First Amendment rights typically don’t apply in private schools.

What does free speech mean?; United States Courts . Tinker v. Des Moines; United States Courts . Freedom of expression in the arts and entertainment; ACLU .

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Constitution of the United States

First amendment.

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

freedom of speech

Primary tabs.

Freedom of speech is the right to speak, write, and share ideas and opinions without facing punishment from the government. The First Amendment protects this right by prohibiting Congress from making laws that would curtail freedom of speech.

Even though freedom of speech is protected from infringement by the government, the government is still free to restrict speech in certain circumstances. Some of these circumstances include:

• Obscenity and Indecency – In Alliance for Community Media v. FCC , the Supreme Court found that obscenity and child pornography have no right to protection from the First Amendment, and as such, the government has the ability to ban this media altogether. But when it comes to indecency, which is generally defined by the courts as something describing or depicting offensive sexual activity, the Supreme Court has found this speech protected. But the government can regulate this speech on radio and television, so long as it’s for a compelling reason and is done in the least restrictive manner. 
• Defamation – Private and public figures are able to sue someone for statements they have made. Public figures must prove that the person made the statement with malice , which means knowing the statement was false or having a reckless disregard for the truth or falsity of the statement. (See  New York Times v. Sullivan ) . Private figures must prove the person failed to act with reasonable care when they made the statement. 
• Incitement – If a person has the intention of inciting the violations of laws that is imminent and likely, while directing this incitement at a person or groups of persons, their speech will not be protected under the First Amendment. This test was created by the Supreme Court in Brandenburg v. Ohio . 
• Fighting words  

While the public has a right to freedom of speech when it comes to the U.S. government, the public does not have this right when it comes to private entities. Companies and private employers are able to regulate speech on their platforms and within their workplace since the First Amendment only applies to the government. This right allowed Facebook, Instagram, and Twitter to ban President Donald Trump from their sites in 2021 without legal repercussion. Companies like Facebook and YouTube were also able to ban misleading information on Covid-19 during the 2020 pandemic.

The Supreme Court recently affirmed that private entities are not restricted by the First Amendment in the case Manhattan Community Access Corporation v. Halleck . Manhattan Neighborhood Network is a nonprofit that was given the authority by New York City to operate public access channels in Manhattan. The organization decided to suspend two of their employees after they received complaints about a film the employees produced. The employees argued that this was a violation of their First Amendment freedom of speech rights because they were being punished due to the content of their film. The Supreme Court held that Manhattan Neighborhood Network was not a government entity or a state actor , so the nonprofit couldn’t be subjected to the First Amendment.

In another case, Nyabwa v. Facebook , the Southern District of Texas also affirmed that private entities are not subject to the First Amendment. There, the plaintiff had a Facebook account, which spoke on President Donald Trump’s business conflicts of interest. Facebook decided to lock the account, so the plaintiff was no longer able to access it. The plaintiff decided to sue Facebook because he believed the company was violating his First Amendment rights. The court dismissed the lawsuit stating that the First Amendment prevents Congress and other government entities from restricting freedom of speech, not private entities. 

[Last updated in June of 2021 by the Wex Definitions Team ] 

Free Speech

Protecting free speech means protecting a free press, the democratic process, diversity of thought, and so much more. The ACLU has worked since 1920 to ensure that freedom of speech is protected for everyone.

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“Freedom of expression is the matrix, the indispensable condition, of nearly every other form of freedom.”

—U.S. Supreme Court Justice Benjamin N. Cardozo in Palko v. Connecticut

Freedom of speech, the press, association, assembly, and petition: This set of guarantees, protected by the First Amendment, comprises what we refer to as freedom of expression. It is the foundation of a vibrant democracy, and without it, other fundamental rights, like the right to vote, would wither away.

The fight for freedom of speech has been a bedrock of the ACLU’s mission since the organization was founded in 1920, driven by the need to protect the constitutional rights of conscientious objectors and anti-war protesters. The organization’s work quickly spread to combating censorship, securing the right to assembly, and promoting free speech in schools.

Almost a century later, these battles have taken on new forms, but they persist. The ACLU’s Speech, Privacy, and Technology Project continues to champion freedom of expression in its myriad forms — whether through protest, media, online speech, or the arts — in the face of new threats. For example, new avenues for censorship have arisen alongside the wealth of opportunities for speech afforded by the Internet. The threat of mass government surveillance chills the free expression of ordinary citizens, legislators routinely attempt to place new restrictions on online activity, and journalism is criminalized in the name of national security. The ACLU is always on guard to ensure that the First Amendment’s protections remain robust — in times of war or peace, for bloggers or the institutional press, online or off.

Over the years, the ACLU has represented or defended individuals engaged in some truly offensive speech. We have defended the speech rights of communists, Nazis, Ku Klux Klan members, accused terrorists, pornographers, anti-LGBT activists, and flag burners. That’s because the defense of freedom of speech is most necessary when the message is one most people find repulsive. Constitutional rights must apply to even the most unpopular groups if they’re going to be preserved for everyone.

Some examples of our free speech work from recent years include:

• In 2019, we filed a petition of certiorari on behalf of DeRay Mckesson, a prominent civil rights activist and Black Lives Matter movement organizer, urging the Supreme Court to overturn a lower court ruling that, if left standing, would dismantle civil rights era speech protections safeguarding the First Amendment right to protest.
• In 2019, we successfully challenged a spate of state anti-protest laws aimed at Indigenous and climate activists opposing pipeline construction.
• We’ve called on big social media companies to resist calls for censorship.
• We’re representing five former intelligence agency employees and military personnel in a lawsuit challenging the government’s pre-publication review system, which prohibits millions of former intelligence agency employees and military personnel from writing or speaking about topics related to their government service without first obtaining government approval.
• In 2018, we filed a friend-of-the-court brief arguing that the NRA’s lawsuit alleging that the state of New York violated its First Amendment rights should be allowed to proceed.
• In 2016, the we defended the First Amendment rights of environmental and racial justice activists in Uniontown, Alabama, who were sued for defamation after they organized against the town’s hazardous coal ash landfill.
• In 2014, the ACLU of Michigan filed an amicus brief arguing that the police violated the First Amendment by ejecting an anti-Muslim group called Bible Believers from a street festival based on others’ violent reactions to their speech.

Today, years of hard-fought civil liberty protections are under threat.

To influence lawmakers, we need everyone to get involved. Here is 1 action you can take today:

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• Introduction

Which government actions are subject to the First Amendment?

Freedoms of speech, of the press, of assembly, and to petition.

• Speech on government property and in government-run institutions
• Related rights
• Free exercise of religion
• The establishment clause

• Why was the Bill of Rights added?
• How was the Bill of Rights added to the U.S. Constitution?
• Does the Bill of Rights apply to the states?

First Amendment

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First Amendment , amendment (1791) to the Constitution of the United States that is part of the Bill of Rights and reads,

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech , or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

The clauses of the amendment are often called the establishment clause , the free exercise clause, the free speech clause, the free press clause, the assembly clause, and the petition clause.

The First Amendment, like the rest of the Bill of Rights, originally restricted only what the federal government may do and did not bind the states. Most state constitutions had their own bills of rights, and those generally included provisions similar to those found in the First Amendment. But the state provisions could be enforced only by state courts.

In 1868, however, the Fourteenth Amendment was added to the U.S. Constitution, and it prohibited states from denying people “liberty” without “ due process .” Since then the U.S. Supreme Court has gradually used the due process clause to apply most of the Bill of Rights to state governments. In particular, from the 1920s to the ’40s the Supreme Court applied all the clauses of the First Amendment to the states. Thus, the First Amendment now covers actions by federal, state, and local governments. The First Amendment also applies to all branches of government, including legislatures, courts, juries, and executive officials and agencies. This includes public employers, public university systems, and public school systems.

The First Amendment, however, applies only to restrictions imposed by the government, since the First and Fourteenth amendments refer only to government action. As a result, if a private employer fires an employee because of the employee’s speech, there is no First Amendment violation. There is likewise no violation if a private university expels a student for what the student said, if a commercial landlord restricts what bumper stickers are sold on the property it owns, or if an Internet service provider refuses to host certain Web sites.

Legislatures sometimes enact laws that protect speakers or religious observers from retaliation by private organizations. For example, Title VII of the federal Civil Rights Act of 1964 bans religious discrimination even by private employers. Similarly, laws in some states prohibit employers from firing employees for off-duty political activity. But such prohibitions are imposed by legislative choice rather than by the First Amendment.

The freedoms of speech , of the press , of assembly, and to petition—discussed here together as “ freedom of expression ”—broadly protect expression from governmental restrictions. Thus, for instance, the government may not outlaw antiwar speech, speech praising violence , racist speech, pro- communist speech, and the like. Nor may the government impose special taxes on speech on certain topics or limit demonstrations that express certain views. The government also may not authorize civil lawsuits based on people’s speech, unless the speech falls within a traditionally recognized First Amendment exception. This is why, for example, people may not sue for emotional distress inflicted by offensive magazine articles about them, unless the articles are not just offensive but include false statements that fall within the defamation exception ( see below Permissible restrictions on expression ).

The free expression guarantees are not limited to political speech. They also cover speech about science, religion, morality , and social issues as well as art and even personal gossip.

Freedom of the press confirms that the government may not restrict mass communication . It does not, however, give media businesses any additional constitutional rights beyond what nonprofessional speakers have.

Freedom of petition protects the right to communicate with government officials. This includes lobbying government officials and petitioning the courts by filing lawsuits, unless the court concludes that the lawsuit clearly lacks any legal basis.

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The first amendment, interpretation & debate, freedom of speech and the press, matters of debate, common interpretation, fixing free speech, frontiers for free speech.

by Geoffrey R. Stone

Edward H. Levi Distinguished Service Professor of Law at the University of Chicago Law School

by Eugene Volokh

Gary T. Schwartz Distinguished Professor of Law; Founder and Co-Author of "The Volokh Conspiracy" at Reason Magazine

“Congress shall make no law . . .  abridging the freedom of speech, or of the press.” What does this mean today? Generally speaking, it means that the government may not jail, fine, or impose civil liability on people or organizations based on what they say or write, except in exceptional circumstances.

Although the First Amendment says “Congress,” the Supreme Court has held that speakers are protected against all government agencies and officials: federal, state, and local, and legislative, executive, or judicial. The First Amendment does not protect speakers, however, against private individuals or organizations, such as private employers, private colleges, or private landowners. The First Amendment restrains only the government.

The Supreme Court has interpreted “speech” and “press” broadly as covering not only talking, writing, and printing, but also broadcasting, using the Internet, and other forms of expression. The freedom of speech also applies to symbolic expression, such as displaying flags, burning flags, wearing armbands, burning crosses, and the like.

The Supreme Court has held that restrictions on speech because of its content —that is, when the government targets the speaker’s message—generally violate the First Amendment. Laws that prohibit people from criticizing a war, opposing abortion, or advocating high taxes are examples of unconstitutional content-based restrictions. Such laws are thought to be especially problematic because they distort public debate and contradict a basic principle of self-governance: that the government cannot be trusted to decide what ideas or information “the people” should be allowed to hear.

There are generally three situations in which the government can constitutionally restrict speech under a less demanding standard.

1. In some circumstances, the Supreme Court has held that certain types of speech are of only “low” First Amendment value, such as:

a. Defamation: False statements that damage a person’s reputations can lead to civil liability (and even to criminal punishment), especially when the speaker deliberately lied or said things they knew were likely false. New York Times v. Sullivan (1964).

b. True threats: Threats to commit a crime (for example, “I’ll kill you if you don’t give me your money”) can be punished. Watts v. United States (1969).

c. “Fighting words”: Face-to-face personal insults that are likely to lead to an immediate fight are punishable. Chaplinsky v. New Hampshire (1942). But this does not include political statements that offend others and provoke them to violence.  For example, civil rights or anti-abortion protesters cannot be silenced merely because passersby respond violently to their speech. Cox v. Louisiana (1965).

d. Obscenity: Hard-core, highly sexually explicit pornography is not protected by the First Amendment. Miller v. California (1973). In practice, however, the government rarely prosecutes online distributors of such material.

e. Child pornography: Photographs or videos involving actual children engaging in sexual conduct are punishable, because allowing such materials would create an incentive to sexually abuse children in order to produce such material. New York v. Ferber (1982).

f. Commercial advertising: Speech advertising a product or service is constitutionally protected, but not as much as other speech. For instance, the government may ban misleading commercial advertising, but it generally can’t ban misleading political speech. Virginia Pharmacy v. Virginia Citizens Council (1976).

Outside these narrow categories of “low” value speech, most other content-based restrictions on speech are presumptively unconstitutional. Even entertainment, vulgarity, “hate speech” (bigoted speech about particular races, religions, sexual orientations, and the like), blasphemy (speech that offends people’s religious sensibilities), and violent video games are protected by the First Amendment. The Supreme Court has generally been very reluctant to expand the list of “low” value categories of speech.

2. The government can restrict speech under a less demanding standard when the speaker is in a special relationship to the government. For example, the speech of government employees and of students in public schools can be restricted, even based on content, when their speech is incompatible with their status as public officials or students. A teacher in a public school, for example, can be punished for encouraging students to experiment with illegal drugs, and a government employee who has access to classified information generally can be prohibited from disclosing that information. Pickering v. Board of Education (1968).

3. The government can also restrict speech under a less demanding standard when it does so without regard to the content or message of the speech. Content-neutral restrictions, such as restrictions on noise, blocking traffic, and large signs (which can distract drivers and clutter the landscape), are generally constitutional as long as they are “reasonable.” Because such laws apply neutrally to all speakers without regard to their message, they are less threatening to the core First Amendment concern that government should not be permitted to favor some ideas over others. Turner Broadcasting System, Inc. v. FCC (1994). But not all content-neutral restrictions are viewed as reasonable; for example, a law prohibiting all demonstrations in public parks or all leafleting on public streets would violate the First Amendment. Schneider v. State (1939).

Courts have not always been this protective of free expression. In the nineteenth century, for example, courts allowed punishment of blasphemy, and during and shortly after World War I the Supreme Court held that speech tending to promote crime—such as speech condemning the military draft or praising anarchism—could be punished. Schenck v. United States (1919). Moreover, it was not until 1925 that the Supreme Court held that the First Amendment limited state and local governments, as well as the federal government. Gitlow v. New York (1925).

But starting in the 1920s, the Supreme Court began to read the First Amendment more broadly, and this trend accelerated in the 1960s. Today, the legal protection offered by the First Amendment is stronger than ever before in our history.

Three issues involving the freedom of speech are most pressing for the future.

Money, Politics, and the First Amendment

The first pressing issue concerns the regulation of money in the political process. Put simply, the question is this: To what extent, and in what circumstances, can the government constitutionally restrict political expenditures and contributions in order to “improve” the democratic process?

In its initial encounters with this question, the Supreme Court held that political expenditures and contributions are “speech” within the meaning of the First Amendment because they are intended to facilitate political expression by political candidates and others. The Court also recognized, however, that political expenditures and contributions could be regulated consistent with the First Amendment if the government could demonstrate a sufficiently important justification. In Buckley v. Valeo (1976), for example, the Court held that the government could constitutionally limit the amount that individuals could contribute to political candidates in order to reduce the risk of undue influence, and in McConnell v. Federal Election Commission (2003), the Court held that the government could constitutionally limit the amount that corporations could spend in the political process in order to influence electoral outcomes.

In more recent cases, though, in a series of five-to-four decisions, the Supreme Court has overruled McConnell and held unconstitutional most governmental efforts to regulate political expenditures and contributions. Citizens United v. Federal Election Commission (2010); McCutcheon v. Federal Election Commission (2014). As a result of these more recent decisions, almost all government efforts to limit the impact of money in the political process have been held unconstitutional, with the consequence that corporations and wealthy individuals now have an enormous impact on American politics.

Those who object to these decisions maintain that regulations of political expenditures and contributions are content-neutral restrictions of speech that should be upheld as long as the government has a sufficiently important justification. They argue that the need to prevent what they see as the corruption and distortion of American politics caused by the excessive influence of a handful of very wealthy individuals and corporations is a sufficiently important government interest to justify limits on the amount that those individuals and corporations should be permitted to spend in the electoral process.

Because these recent cases have all been five-to-four decisions, it remains to be seen whether a differently constituted set of justices in the future will adhere to the current approach, or whether they will ultimately overrule or at least narrowly construe those decisions. In many ways, this is the most fundamental First Amendment question that will confront the Supreme Court and the nation in the years to come.

The Meaning of “Low” Value Speech

The second pressing free speech issue concerns the scope of “low” value speech. In recent years, the Supreme Court has taken a narrow view of the low value concept, suggesting that, in order for a category of speech to fall within that concept, there has to have been a long history of government regulation of the category in question. This is true, for example, of such low value categories as defamation, obscenity, and threats. An important question for the future is whether the Court will adhere to this approach.

The primary justification for the Court’s insistence on a history of regulation is that this limits the discretion of the justices to pick-and-choose which categories of expression should be deemed to have only low First Amendment value. A secondary justification for the Court’s approach is that a history of regulation of a category of expression provides some basis in experience for evaluating the possible effects – and dangers – of declaring a new category of speech to have only low First Amendment value.

Why does this doctrine matter? To cite one illustration, under the Court’s current approach, so-called “hate speech” – speech that expressly denigrates individuals on the basis of such characteristics as race, religion, gender, national origin, and sexual orientation – does not constitute low value speech because it has not historically been subject to regulation. As a result, except in truly extraordinary circumstances, such expression cannot be regulated consistent with the First Amendment. Almost every other nation allows such expression to be regulated and, indeed, prohibited, on the theory that it does not further the values of free expression and is incompatible with other fundamental values of society.

Similarly, under the Court’s approach to low value speech it is unclear whether civil or criminal actions for “invasion of privacy” can be reconciled with the First Amendment. For example, can an individual be punished for distributing on the Internet “private” information about other persons without their consent? Suppose, for example, an individual posts naked photos of a former lover on the Internet. Is that speech protected by the First Amendment, or can it be restricted as a form of “low” value speech? This remains an unresolved question.

Leaks of Classified Information

The Supreme Court has held that the government cannot constitutionally prohibit the publication of classified information unless it can demonstrate that the publication or distribution of that information will cause a clear and present danger of grave harm to the national security. New York Times v. United States (The “Pentagon Papers” case) (1971). At the same time, though, the Court has held that government employees who gain access to such classified information can be restricted in their unauthorized disclosure of that information. Snepp v. United States (1980). It remains an open question, however, whether a government employee who leaks information that discloses an unconstitutional, unlawful, or unwise classified program can be punished for doing so. This issue has been raised by a number of recent incidents, including the case of Edward Snowden. At some point in the future, the Court will have to decide whether and to what extent the actions of government leakers like Edward Snowden are protected by the First Amendment.

I like Professor Stone’s list of important issues. I think speech about elections, including speech that costs money, must remain protected, whether it’s published by individuals, nonprofit corporations, labor unions, media corporations, or nonmedia business corporations. (Direct contributions to candidates, as opposed to independent speech about them, can be restricted, as the Court has held.) And I think restrictions on “hate speech” should remain unconstitutional. But I agree these are likely to be heavily debated issues in the coming years. I’d like to add three more issues as well.

Professional-Client Speech

Many professionals serve their clients by speaking. Psychotherapists try to help their patients by talking with them. Doctors make diagnoses, offer predictions, and recommend treatments. Lawyers give legal advice; financial planners, financial advice. Some of these professionals also do things (such as prescribe drugs, perform surgeries, or file court documents that have legal effect). But much of what they do is speak.

Yet the law heavily regulates such speakers. It bars people from giving any legal, medical, psychiatric, or similar advice unless they first get licenses (which can take years and hundreds of thousands of dollars’ worth of education to get)—though the government couldn’t require a license for people to become journalists or authors. The law lets clients sue professionals for malpractice, arguing that the professionals’ opinions or predictions proved to be “unreasonable” and harmful, though similar lawsuits against newspapers or broadcasters would be unconstitutional.

And the law sometimes forbids or compels particular speech by these professionals. Some states ban psychiatrists from offering counseling aimed at changing young patients’ sexual orientation. Florida has restricted doctors’ questioning their patients about whether the patients own guns. Many states, hoping to persuade women not to get abortions, require doctors to say certain things or show certain things to women who are seeking abortions. The federal government has tried to punish doctors who recommend that their patients use medical marijuana (which is illegal under federal law, but which can be gotten in many states with the doctor’s recommendation).

When are these laws constitutional? Moreover, if there is a First Amendment exception that allows such regulations of professional-client speech, which professions does it cover? What about, for instance, tour guides, fortunetellers, veterinarians, or diet advisors? Courts are only beginning to confront the First Amendment implications of these sorts of restrictions, and the degree to which the government’s interest in protecting clients—and in preventing behavior that the government sees as harmful—can justify restricting professional-client speech.

Crime-Facilitating Speech

Some speech contains information that helps people commit crimes, or get away with committing crimes. Sometimes this is general information, for instance about how bombs are made, how locks can be picked, how deadly viruses can be created, how technological protections for copyrighted works can be easily evaded, or how a contract killer can get away with his crime.

Sometimes this is specific information, such as the names of crime witnesses that criminals might want to silence, the location of police officers whom criminals might want to avoid, or the names of undercover officers or CIA agents. Indeed, sometimes this can be as familiar as people flashing lights to alert drivers that a police officer is watching; people are occasionally prosecuted for this, because they are helping others get away with speeding.

Sometimes this speech is said specifically with the purpose of promoting crime—but sometimes it is said for other purposes: consider chemistry books that talk about explosives; newspaper articles that mention people’s names so the readers don’t feel anything is being concealed; or novels that accurately describe crimes just for entertainment. And sometimes it is said for political purposes, for instance when someone describes how easy it is to evade copyright law or proposed laws prohibiting 3-D printing of guns, in trying to explain why those laws need to be rejected.

Surprisingly, the Supreme Court has never explained when such speech can be restricted. The narrow incitement exception, which deals with speech that aims to persuade people to commit imminent crimes, is not a good fit for speech that, deliberately or not, informs people about how to commit crimes at some point in the future. This too is a field that the Supreme Court will likely have to address in coming decades.

“Hostile Environment Harassment” Rules

Finally, some government agencies, courts, and universities have reasoned that the government may restrict speech that sufficiently offends employees, students, or business patrons based on race, religion, sex, sexual orientation, and the like. Here’s how the theory goes: Laws ban discrimination based on such identity traits in employment, education, and public accommodations. And when speech is “severe or pervasive” enough to create a “hostile or offensive environment” based on those traits, such speech becomes a form of discrimination. Therefore, the argument goes, a wide range of speech—such as display of Confederate flags, unwanted religious proselytizing, speech sharply criticizing veterans, speech suggesting that Muslims are disloyal, display of sexually suggestive materials, sexually-themed humor, sex-based job titles (such as “foreman” or “draftsman”), and more—can lead to lawsuits.

Private employers are paying attention, and restricting such speech by their employees. Universities are enacting speech codes restricting such speech. Even speech in restaurants and other public places, whether put up by the business owner or said by patrons, can lead to liability for the owner. And this isn’t limited to offensive speech said to a particular person who doesn’t want to hear it. Even speech posted on the wall or overheard in the lunchroom can lead to liability, and would thus be suppressed by “hostile environment” law.

To be sure, private employers and business owners aren’t bound by the First Amendment, and are thus generally free to restrict such speech on their property. And even government employers and enterprises generally have broad latitude to control what is said on their property (setting aside public universities, which generally have much less such latitude). But here the government is pressuring all employers, universities, and businesses to impose speech codes, by threatening liability on those who don’t impose such codes. And that government pressure is subject to First Amendment scrutiny.

Some courts have rejected some applications of this “hostile environment” theory on First Amendment grounds; others have upheld other applications. This too is something the Supreme Court will have to consider.

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