Censorship in the United States is bounded on one side by the First Amendment, which stops federal, state, and local governments from suppressing most speech, and on the other by a short list of exceptions and specialized regulatory zones where the government does have room to act. Private companies, including social media platforms and employers, sit entirely outside that constitutional framework and can restrict speech on their own property as they see fit.
That basic split, government-versus-private, is where most public confusion starts. The rest of the picture is a set of doctrines built case by case: what the government must prove to justify a speech restriction, which categories of expression the Supreme Court has stripped of protection, and which industries or settings operate under tighter rules than ordinary public discourse.
What the First Amendment Blocks the Government From Doing
The First Amendment states that “Congress shall make no law . . . abridging the freedom of speech, or of the press.”1Congress.gov. Constitution of the United States – First Amendment Through the Fourteenth Amendment, that prohibition reaches every level of government: state legislatures, city councils, public school boards, police departments, and public universities.
When a government body restricts speech because of what it says, courts apply strict scrutiny, the highest level of constitutional review. The government has to prove the restriction serves a compelling interest and is drawn as narrowly as possible.2Legal Information Institute. Content Based Regulation Most content-based laws fail. In Reed v. Town of Gilbert, the Supreme Court held that any law drawing distinctions based on the content of speech is presumptively unconstitutional and automatically subject to strict scrutiny, whatever the government says its motive was.3Oyez. Reed et al. v. Town of Gilbert, Arizona et al.
The most extreme form of censorship, prior restraint, is nearly always off the table. That is where the government blocks a publication before it reaches the public. The Supreme Court ruled in Near v. Minnesota that this kind of advance suppression is generally unconstitutional.4Justia. Near v. Minnesota, 283 U.S. 697 (1931) The government can punish unlawful speech after it happens; it cannot appoint itself a gatekeeper deciding what the public gets to hear. Only extremely narrow national-security exceptions have been tolerated.
Not every government rule about speech targets the message, and the ones that don’t are treated differently. Noise ordinances, parade permits, and protest-zone regulations are content-neutral time, place, and manner restrictions. In Ward v. Rock Against Racism, the Supreme Court held that such rules are valid when they are justified without reference to content, are not substantially broader than necessary to serve a significant government interest, and leave open alternative channels of communication.5Oyez. Ward v. Rock Against Racism A city can require a permit for a large march to manage traffic. It cannot hand out permits based on which groups it likes.
Speech the Government Is Allowed to Punish
The First Amendment covers most expression, but the Supreme Court has identified specific categories that fall outside its protection. These are the areas where the government can prosecute or impose civil liability without violating the Constitution.
Obscenity
Obscene material has no First Amendment protection. The Supreme Court defined obscenity in Miller v. California using a three-part test: the material, taken as a whole, must appeal to a sexual interest when judged by community standards; it must depict sexual conduct in a clearly offensive way as defined by applicable law; and it must lack serious literary, artistic, political, or scientific value.6Justia. Miller v. California, 413 U.S. 15 (1973) All three elements must be met. Because community standards vary, material that would be unremarkable in one place can support prosecution in another.
Incitement to Imminent Lawless Action
Speech that is intended to spark immediate violence or illegal activity, and is likely to do so, can be punished. The Supreme Court set that standard in Brandenburg v. Ohio, overturning the conviction of a Ku Klux Klan leader because his statements were abstract advocacy rather than a direct call to immediate action.7Library of Congress. Brandenburg v. Ohio Advocating illegal conduct in general terms remains protected. The threat has to be specific and imminent.
True Threats
Statements communicating a serious intent to commit violence against a person or group are “true threats” and unprotected. The Supreme Court defined the category in Virginia v. Black, framing the prohibition as protecting people both from the fear of violence and from the disruption that fear creates.8Justia. Virginia v. Black, 538 U.S. 343 (2003) The speaker does not need to actually intend to follow through. In 2023, the Court clarified the mental state required in Counterman v. Colorado, holding that the government must prove the speaker acted at least recklessly, meaning they consciously disregarded a substantial risk that their words would be perceived as threatening.9Supreme Court of the United States. Counterman v. Colorado (2023)
Fighting Words
Direct, face-to-face personal insults likely to provoke an immediate violent reaction are “fighting words” and unprotected. The Supreme Court set out the category in Chaplinsky v. New Hampshire, upholding the conviction of a man who called a city marshal a “damned racketeer” and “damned Fascist.”10Justia U.S. Supreme Court Center. Chaplinsky v. New Hampshire Courts have narrowed the doctrine significantly since 1942, and successful prosecutions are rare. Offensive commentary directed at no one in particular does not qualify.
Defamation
False statements of fact that damage a person’s reputation can be punished through defamation law, but the standard varies with the target. Public officials and public figures must prove “actual malice,” meaning the speaker either knew the statement was false or acted with reckless disregard for its truth. The Supreme Court established that bar in New York Times Co. v. Sullivan to prevent defamation suits from being used to silence criticism of the government.11Justia. New York Times Co. v. Sullivan, 376 U.S. 254 (1964) Private individuals typically only need to prove negligence.
Child Pornography
Child pornography is its own unprotected category, separate from obscenity. In New York v. Ferber, the Supreme Court held that states have broad authority to ban production, distribution, and possession of sexual depictions of children because the harm falls directly on the children used in the material.12Justia. New York v. Ferber, 458 U.S. 747 (1982) The Miller factors do not apply.
The First Amendment Does Not Apply to Private Companies
This is the most common misunderstanding in American speech debates. The First Amendment restricts the government. It does not restrict private employers, social media platforms, churches, publishers, or homeowners’ associations.13Legal Information Institute. State Action Doctrine and Free Speech
Constitutional protections apply only when a “state actor” is involved. A private company that fires an employee over social media posts, or a platform that removes an account for violating its rules, is exercising its own property and association rights. Courts recognize narrow exceptions where a private entity performs a traditional government function, is coerced by the government into acting, or acts jointly with a government body, but those situations are rare.
Federal law goes further and actively encourages platforms to moderate. Section 230 of the Communications Decency Act does two things. It treats platforms as something other than the publisher of content posted by their users, shielding them from most liability for what other people say. And it protects platforms that voluntarily remove material they consider obscene, violent, harassing, or otherwise objectionable, even when the removed content would be constitutionally protected against government censorship.14Office of the Law Revision Counsel. 47 USC 230 – Protection for Private Blocking and Screening of Offensive Material A platform can be aggressive or lenient about moderation without losing its liability shield.
Where the Government Does Have Extra Room
Beyond the categorical exceptions, the government has more authority to restrict speech in specific settings. These are the zones where a searcher’s assumption about “free speech” is most likely to be wrong.
Advertising and Commercial Speech
Advertising receives First Amendment protection, but less than political speech. The Supreme Court laid out the framework in Central Hudson Gas v. Public Service Commission. The speech must concern lawful activity and not be misleading. If it does, the government must show a substantial interest, must demonstrate that the regulation directly advances that interest, and must prove the restriction is no more extensive than necessary.15Justia. Central Hudson Gas and Elec. v. Public Svc. Commn, 447 U.S. 557 (1980)16Office of the Law Revision Counsel. 15 USC 45 – Unfair Methods of Competition Unlawful17Federal Trade Commission. Truth In Advertising
Broadcast Radio and Television
Over-the-air broadcasters operate under tighter rules than any other mass medium. Because they use public airwaves under federal license, the FCC can prohibit obscene content at all times and restrict indecent or profane material during hours when children are likely to be watching or listening. The restricted window runs from 6 a.m. to 10 p.m. local time, with a “safe harbor” for indecent content from 10 p.m. to 6 a.m.18Federal Communications Commission. Obscene, Indecent and Profane Broadcasts
Violations are expensive. Broadcasting obscene, indecent, or profane language can lead to criminal prosecution carrying up to two years in prison.19Office of the Law Revision Counsel. 18 US Code 1464 – Broadcasting Obscene Language The FCC can also impose civil forfeiture penalties of up to $508,373 per violation, with a cap of roughly $4.7 million for a single continuing violation, and can revoke a station’s license.20Federal Communications Commission. FCC Forfeiture Policy Statement None of this applies to cable, satellite, or streaming, which is why content on those services routinely goes further than what appears on broadcast.
Public Schools and Universities
Public schools are government entities bound by the First Amendment, but they also have an educational mission courts recognize as a reason for some control. Different standards apply depending on the setting.
Students keep their free-speech rights on campus. The Supreme Court said in Tinker v. Des Moines that students do not “shed their constitutional rights to freedom of speech or expression at the schoolhouse gate.”21United States Courts. Facts and Case Summary – Tinker v. Des Moines Administrators can restrict student speech only when they can show it would substantially disrupt the educational process.
School-sponsored publications are different. In Hazelwood v. Kuhlmeier, the Court gave officials broader authority to edit or censor student newspapers, plays, and other activities carrying the school’s name, provided their decisions are based on legitimate educational concerns rather than viewpoint suppression.22Justia. Hazelwood School District v. Kuhlmeier A personal blog gets Tinker protection; an article in the school-funded paper can be pulled by an administrator.
School libraries occupy a middle ground. In Board of Education v. Pico, the Supreme Court ruled that school boards cannot remove books from library shelves simply because they dislike the ideas those books contain; removal decisions must rest on educational suitability, not political or religious orthodoxy.23Justia. Island Trees Sch. Dist. v. Pico by Pico, 457 U.S. 853 (1982)
Public universities face tighter constraints than K–12 schools. The Supreme Court held in Rosenberger v. University of Virginia that when a public university collects student activity fees and distributes them to student organizations, it must do so in a viewpoint-neutral way, and cannot deny funding to a group because it disagrees with the group’s message.24Legal Information Institute. Rosenberger v. University of Va., 515 U.S. 819 (1995)
National Security
National security is where the government’s authority to suppress information is at its broadest. Executive Order 13526 establishes three classification levels based on the expected damage from disclosure: Confidential (damage), Secret (serious damage), and Top Secret (exceptionally grave damage).25National Archives. Executive Order 13526 Anyone with access signs a nondisclosure agreement, and unauthorized disclosure can end in loss of clearance, firing, and prosecution.
The Espionage Act is the primary criminal statute. Gathering, transmitting, or losing national defense information carries up to ten years in prison per offense.26Office of the Law Revision Counsel. 18 US Code 793 – Gathering, Transmitting or Losing Defense Information Delivering such information to a foreign government can bring life imprisonment or, in cases involving the death of an intelligence agent or compromised nuclear weapons information, execution.27Office of the Law Revision Counsel. 18 US Code 794 – Gathering or Delivering Defense Information to Aid Foreign Government These statutes apply to government employees and private citizens alike.
The Freedom of Information Act lets the public request government records, but its first exemption covers information properly classified under an executive order in the interest of national defense or foreign policy.28Office of the Law Revision Counsel. 5 USC 552 – Public Information; Agency Rules, Opinions, Orders, Records, and Proceedings Agencies invoke it routinely to withhold documents or redact passages, and courts give substantial deference to those decisions.
Former intelligence employees face a lifelong restriction. The CIA’s Prepublication Classification Review Board requires current and former officers and contractors to submit all intelligence-related materials, including books, opinion pieces, academic papers, speeches, and résumés that reference agency-specific details, before publication.29CIA. Prepublication Classification Review Board The Supreme Court upheld the arrangement in Snepp v. United States, ruling that a former CIA officer who published without submitting for review breached a fiduciary obligation. The Court imposed a constructive trust on all of his book profits.30Justia. Snepp v. United States, 444 U.S. 507 (1980)
Copyright Takedowns as a Route to Removal
Government censorship is not the only mechanism that can take speech offline. The Digital Millennium Copyright Act establishes a notice-and-takedown system under which copyright holders can demand that platforms remove content they believe infringes their rights. To keep its safe harbor from infringement liability, the platform must remove the material promptly on receipt of a valid notice. The person who posted the content can file a counter-notification, and unless the copyright holder sues within a set period, the material is restored.31Office of the Law Revision Counsel. 17 USC 512 – Limitations on Liability Relating to Material Online
The system removes pirated material efficiently and is also vulnerable to abuse. Businesses, public figures, and governments have used takedown notices to suppress criticism, remove unflattering coverage, and silence competitors. The statute penalizes bad-faith notices: anyone who knowingly misrepresents that material is infringing can be liable for damages, including the target’s lost revenue and legal costs.31Office of the Law Revision Counsel. 17 USC 512 – Limitations on Liability Relating to Material Online Proving that a sender knew the notice was false is difficult, and most targets lack the resources to fight in court. A notice alone can silence speech for weeks even when the underlying claim has no merit.