The Supreme Court cases on freedom of speech that most shape current First Amendment law form a recognizable canon: Brandenburg on incitement, New York Times v. Sullivan on defamation, Tinker on student expression, Miller on obscenity, Texas v. Johnson on symbolic conduct, Central Hudson on advertising, Buckley and Citizens United on campaign spending, and Packingham and Moody v. NetChoice on speech online. Each ruling answers a specific question about what the government can and cannot restrict, and together they set the framework courts still use.
Incitement and Advocacy of Illegal Action
Brandenburg v. Ohio (1969) supplies the modern test for punishing radical or inflammatory speech. A Ku Klux Klan leader had been convicted under an Ohio law for advocating violence at a rally. The Supreme Court threw out the conviction and ruled that the government cannot punish speech advocating illegal action unless the speech is both directed at producing imminent lawless action and likely to produce it.1Justia U.S. Supreme Court Center. Brandenburg v. Ohio, 395 U.S. 444 (1969)
Both conditions have to be met. The speaker must intend to trigger immediate illegal conduct, not float an abstract idea about breaking the law someday. And the speech must be objectively likely to produce that immediate response. Talking about revolution in the abstract, writing an angry essay, saying something deeply offensive — all of it remains protected. Prosecutors have to prove a direct, concrete link between the words and a crime about to happen.
Threats and Fighting Words
Some categories of speech have never carried First Amendment protection. Chaplinsky v. New Hampshire (1942) identified “fighting words,” defined as words that by their very utterance inflict injury or tend to provoke an immediate breach of the peace. The Court reasoned that such speech contributes so little to the exchange of ideas that any benefit is “clearly outweighed by the social interest in order and morality.”2Justia U.S. Supreme Court Center. Chaplinsky v. New Hampshire, 315 U.S. 568 (1942) Later decisions narrowed the doctrine, and convictions resting purely on fighting words are now rare.
The related category of “true threats” covers communications expressing a serious intent to commit violence. In Counterman v. Colorado (2023), which involved hundreds of Facebook messages sent to a musician, the Court held that a true-threats prosecution requires proof the speaker acted with at least recklessness, meaning the speaker consciously disregarded a substantial risk that the messages would be viewed as threatening.3Justia U.S. Supreme Court Center. Counterman v. Colorado, 600 U.S. ___ (2023) A purely objective test asking only whether a reasonable person would feel threatened is not enough. Prosecutors need some evidence of what was going on in the speaker’s head.
Defamation and the Actual Malice Rule
False statements that damage reputation can trigger civil liability, but the First Amendment sharply limits that liability when the target is a public official. New York Times Co. v. Sullivan (1964) established the “actual malice” standard: a public official suing for defamation must prove the speaker knew the statement was false or acted with reckless disregard for whether it was true.4Justia U.S. Supreme Court Center. New York Times Co. v. Sullivan, 376 U.S. 254 (1964) A simple factual mistake in a news story is not enough. The plaintiff has to show the publisher lied deliberately or published with serious doubts about accuracy.
The rule was designed to prevent officials from using defamation lawsuits to chill criticism. Without it, journalists might steer away from controversial reporting for fear that any minor error could trigger expensive litigation. The standard shifts the burden so far that public officials rarely win these cases, and the Court intended that result: open debate about government conduct outweighs an individual official’s interest in shielding a reputation from honest mistakes.
Private citizens face a lower burden. Gertz v. Robert Welch, Inc. (1974) held that states cannot impose strict liability in defamation cases, but they may set their own fault standard for private-figure plaintiffs rather than requiring actual malice.5Justia U.S. Supreme Court Center. Gertz v. Robert Welch, Inc., 418 U.S. 323 (1974) Most states require private plaintiffs to prove at least negligence. If a private individual wants punitive damages, though, actual malice is still required. People who have not voluntarily entered public life are held to a lighter proof standard, but the First Amendment still prevents unlimited liability for speech about them.
Obscenity
Obscene material receives no First Amendment protection, but the government cannot simply label something obscene because it involves sex. Miller v. California (1973) established a three-part test, and all three prongs must be satisfied:6Justia U.S. Supreme Court Center. Miller v. California, 413 U.S. 15 (1973)
- An average person applying contemporary community standards would find that the work, taken as a whole, appeals to a prurient interest in sex.
- The work depicts sexual conduct in a patently offensive way under standards defined by applicable state law.
- The work, taken as a whole, lacks serious literary, artistic, political, or scientific value.
Material with genuine artistic or political value is protected even when sexually explicit and even when some community members find it offensive. The “community standards” element means what counts as obscene can vary by jurisdiction, though the serious-value prong is measured against a national standard rather than a local one.
Symbolic Conduct and the Right Not to Speak
First Amendment protection reaches beyond spoken and written words. Texas v. Johnson (1989) struck down a Texas flag-desecration law, holding that burning an American flag as political protest is conduct sufficiently communicative to qualify for constitutional protection.7Justia U.S. Supreme Court Center. Texas v. Johnson, 491 U.S. 397 (1989) The government cannot ban expression simply because society finds the underlying idea offensive. Laws targeting the message rather than some non-communicative feature of the behavior face the highest level of judicial scrutiny and almost always fail.
The flip side is the right not to speak. West Virginia State Board of Education v. Barnette (1943) ruled that public school students cannot be forced to salute the flag or recite the Pledge of Allegiance. Compelling someone to express beliefs they do not hold violates the First Amendment just as much as silencing beliefs they do hold.8Justia U.S. Supreme Court Center. West Virginia State Board of Education v. Barnette, 319 U.S. 624 (1943) The compelled-speech doctrine has proven durable, reaching well beyond the classroom.
How far does protection for offensive speech go? Snyder v. Phelps (2011) tested the outer limits. Members of Westboro Baptist Church picketed a military funeral with inflammatory signs. The Court held that because the picketing addressed matters of public concern, took place on public land, and complied with police instructions, it was entitled to First Amendment protection despite the severe emotional distress it caused the soldier’s family.9Justia U.S. Supreme Court Center. Snyder v. Phelps, 562 U.S. 443 (2011) Speech on public issues occupies the highest rung of First Amendment protection, and that does not change because the speech is hurtful.
Students in Public Schools
Students keep their First Amendment rights inside the schoolhouse, but those rights operate differently there. Tinker v. Des Moines (1969) involved students suspended for wearing black armbands to protest the Vietnam War. The Supreme Court held that school officials cannot suppress student expression unless they can reasonably forecast substantial disruption to school operations or invasion of the rights of others.10Justia U.S. Supreme Court Center. Tinker v. Des Moines Independent Community School District, 393 U.S. 503 (1969) Discomfort with an unpopular viewpoint does not justify censorship.
Morse v. Frederick (2007) carved out a narrow exception. A student unfurled a “BONG HiTS 4 JESUS” banner during a school-supervised event, and the Court held that schools have a compelling interest in deterring drug use among minors and can restrict speech reasonably interpreted as promoting illegal substances.11Justia U.S. Supreme Court Center. Morse v. Frederick, 551 U.S. 393 (2007) The exception is limited to speech that can be read as encouraging drug use, not to political commentary about drug policy.
School-sponsored publications operate under a different standard. Hazelwood School District v. Kuhlmeier (1988) held that educators may exercise editorial control over school-sponsored student expression as long as their decisions are reasonably related to legitimate educational concerns.12Justia U.S. Supreme Court Center. Hazelwood School District v. Kuhlmeier, 484 U.S. 260 (1988) A newspaper produced as part of a journalism class is a classroom exercise subject to teacher oversight, giving administrators more latitude to pull articles they consider inappropriate.
Schools have tried to extend their authority to what students say off campus. Mahanoy Area School District v. B.L. (2021) involved a student who posted vulgar Snapchat messages criticizing her school after being cut from the varsity cheerleading team. The Court held that the school could not punish her for off-campus speech that contained no threats, no bullying, and no disruption to school operations.13Justia U.S. Supreme Court Center. Mahanoy Area School District v. B.L., 594 U.S. ___ (2021) Schools may have some interest in regulating off-campus speech in limited circumstances, but ordinary First Amendment protections apply with full force once a student leaves school grounds.
Time, Place, and Manner Rules
Even fully protected speech can be regulated in terms of when, where, and how it happens, as long as the government is not targeting the message. Ward v. Rock Against Racism (1989) upheld a New York City rule requiring bands performing in Central Park to use city-provided sound equipment. The Court laid out three requirements for valid time, place, and manner restrictions:14Justia U.S. Supreme Court Center. Ward v. Rock Against Racism, 491 U.S. 781 (1989)
- The restriction must be content neutral, not targeted at particular viewpoints or subjects.
- It must serve a significant government interest, such as controlling noise or ensuring public safety.
- It must leave open ample alternative channels for the speaker to communicate the same message.
This framework explains why a city can require a permit for a large march, limit protest hours near residential areas, or set noise limits at outdoor concerts. What a city cannot do is grant permits for messages it likes and deny them for messages it dislikes. The moment a regulation turns on what the speaker is saying rather than the logistics of how they say it, courts apply much stricter scrutiny and the regulation almost always falls.
Commercial Speech
Advertising and other commercial speech get First Amendment protection, but less than political or artistic expression. Central Hudson Gas & Electric v. Public Service Commission (1980) created a four-part test the government must satisfy to restrict commercial speech:15Justia U.S. Supreme Court Center. Central Hudson Gas and Electric Corp. v. Public Service Commission, 447 U.S. 557 (1980)
- The speech must concern a lawful activity and not be misleading. If it fails here, the government can ban it outright.
- The government must identify a substantial interest in restricting the speech.
- The restriction must directly advance that interest, not just theoretically relate to it.
- The restriction cannot be more extensive than necessary to serve the interest.
Under this intermediate standard, governments can regulate false advertising, require product-label disclosures, and restrict marketing of certain products like tobacco far more easily than they could restrict a political pamphlet. They cannot ban truthful commercial speech simply because they disagree with the product being offered. A blanket ban on advertising by a lawful business will generally fail the fourth prong unless the government can show no narrower alternative exists.
Money and Political Campaigns
The relationship between money and political speech has produced some of the most contested First Amendment rulings. Buckley v. Valeo (1976) drew a line between contributions and independent expenditures. Limits on contributions to candidates are constitutional because they help prevent corruption or its appearance. Limits on independent spending to broadcast a political message are not, because that spending is a direct form of political advocacy at the core of the First Amendment.16Justia U.S. Supreme Court Center. Buckley v. Valeo, 424 U.S. 1 (1976)
Citizens United v. Federal Election Commission (2010) extended that reasoning to corporations and unions. The Court held that the government cannot restrict independent expenditures for political communications based on the speaker’s corporate identity, because the First Amendment protects speech itself regardless of who is speaking. Corporations can now spend unlimited amounts on independent political advertisements, but direct contributions to candidates remain capped, and the government may still require disclosure of who is funding political ads.17Federal Election Commission. Citizens United v. FEC
Speech Online
The Court has recognized that the internet, and social media in particular, functions as a modern public square. Packingham v. North Carolina (2017) struck down a state law barring registered sex offenders from accessing social media sites. The Court described social media as one of the most important places in modern life for exchanging views, accessing news, seeking employment, and engaging in protected First Amendment activity.18Justia U.S. Supreme Court Center. Packingham v. North Carolina, 582 U.S. ___ (2017) Cutting someone off entirely from these platforms amounts to barring them from the legitimate exercise of constitutional rights.
A harder question is whether government can force social media companies to carry speech they would prefer to remove. Moody v. NetChoice (2024) addressed Florida and Texas laws that tried to stop large platforms from removing or suppressing certain political content. The Court held that when platforms make editorial choices about what third-party speech to display and how to organize it, those choices are themselves a form of expression protected by the First Amendment. The government cannot mandate that a platform carry messages it would prefer to exclude, any more than it could order a newspaper to publish a letter to the editor. The cases were sent back to the lower courts for a more thorough analysis, and platform content moderation now carries significant constitutional protection.
The digital-era rulings apply the same core principles from the analog cases: the government cannot suppress speech based on viewpoint, cannot compel private parties to carry messages they reject, and cannot cut off access to the forums where public discourse happens. Applying those principles to algorithms, feeds, and platforms with billions of users is producing new questions the Court will keep working through for years.