The landmark freedom of speech cases decided by the Supreme Court set the practical limits of the First Amendment: what the government can punish, what it cannot touch, and where the hard lines fall in between. The rulings below are the ones lawyers, journalists, and courts still cite when a speech dispute arises, grouped by the kind of expression at issue.
Political and Symbolic Expression
The Court’s first serious attempt to draw a line around political dissent came in Schenck v. United States (1919). A man had been convicted under the Espionage Act of 1917 for mailing leaflets urging resistance to the military draft. The Court upheld the conviction and introduced the “clear and present danger” test, allowing speech that posed a direct threat to the war effort to be criminalized.1Library of Congress. Schenck v. United States That standard was later replaced by something far more protective of speech, but Schenck matters as the starting point.
Speech is not limited to words. In Texas v. Johnson (1989), the Court ruled that burning an American flag during a political protest is protected symbolic expression. A Texas law criminalizing desecration of a venerated object could not survive the First Amendment, because the government “may not prohibit the verbal or nonverbal expression of an idea merely because society finds the idea offensive or disagreeable.”2Cornell Law Institute. Texas v. Johnson When conduct carries a political message, its communicative character is protected no matter how much people despise the message.
Snyder v. Phelps (2011) pushed the principle to an uncomfortable place. Members of the Westboro Baptist Church picketed near a military funeral with signs carrying deeply offensive messages. The soldier’s father sued for intentional infliction of emotional distress and won a large jury award, which the Supreme Court reversed. Because the picketers spoke on matters of public concern, from public property, in compliance with local ordinances, the First Amendment shielded them from civil liability.3Library of Congress. Snyder v. Phelps The nation “has chosen to protect even hurtful speech on public issues to ensure that public debate is not stifled,” the Court wrote.
Incitement, Fighting Words, and Threats
Some categories of expression fall outside the First Amendment, but the exceptions are narrower than most people assume. The controlling standard for advocacy of illegal action comes from Brandenburg v. Ohio (1969), which overturned the conviction of a Ku Klux Klan leader prosecuted under Ohio’s criminal syndicalism law.4Justia. Brandenburg v. Ohio Brandenburg replaced Schenck’s older test with something much tougher: speech can be criminalized only when it is both directed at producing imminent lawless action and likely to actually produce it. Abstract advocacy of violence, or vague calls for revolution, do not qualify. The government has to show a direct, immediate link between the words and a real threat of criminal conduct.
A second unprotected category is “fighting words.” Chaplinsky v. New Hampshire (1942) upheld the conviction of a Jehovah’s Witness who insulted a city marshal on a public sidewalk, and defined fighting words as statements that by their nature tend to provoke an immediate violent reaction from the person addressed.5Justia. Chaplinsky v. New Hampshire, 315 US 568 (1942) Courts have applied the doctrine narrowly since, and pure fighting-words convictions are now rare.
The United States has no general hate speech law, and even within categories of unprotected speech the government cannot single out particular viewpoints. In R.A.V. v. City of St. Paul (1992), a teenager burned a cross on a Black family’s lawn and was charged under a city ordinance targeting expressions of hostility based on race, religion, or gender. The Court struck the ordinance down unanimously: even if cross burning could be unprotected fighting words, the city could not selectively ban only those fighting words that carried disfavored messages on race or religion.6Justia. R.A.V. v. City of St. Paul The defect was viewpoint discrimination, not the underlying interest in punishing threatening conduct.
Virginia v. Black (2003) clarified the other side of that line. A state can ban cross burning done with the specific intent to intimidate, because such conduct falls within the “true threats” exception. A properly written intimidation statute targets the threatening nature of the conduct rather than the speaker’s viewpoint.7Constitution Annotated. Viewpoint-Based Distinctions Within Proscribable Speech Read together, R.A.V. and Black say you can ban threats; you cannot ban only threats that express a particular ideology.
Freedom of the Press and Defamation
Few decisions reshaped an entire body of law as thoroughly as New York Times Co. v. Sullivan (1964). Before Sullivan, minor factual errors in reporting on public officials could produce ruinous damage awards. The Court created the “actual malice” standard: a public official suing for defamation must prove the publisher either knew the statement was false or acted with reckless disregard for whether it was true.8Justia. New York Times Co. v. Sullivan, 376 US 254 (1964) Honest mistakes and sloppy fact-checking are not enough. The standard has since been extended to public figures generally.
For private plaintiffs, the rule is different. Gertz v. Robert Welch, Inc. (1974) held that private individuals need not prove actual malice; states can set their own fault standard, so long as they require at least negligence.9Justia. Gertz v. Robert Welch, Inc. Private citizens have not stepped into the spotlight and typically lack the media access to correct false claims on their own. Without proof of actual malice, though, a private plaintiff can only recover for actual proven harm, not presumed or punitive damages. The two-tier system Gertz built still governs American defamation law.
The government also cannot generally stop a story before it runs. In New York Times Co. v. United States (1971), the Nixon administration sought to enjoin the New York Times and Washington Post from publishing the Pentagon Papers, a classified study of decades of decision-making on Vietnam. The Court refused, holding that the government carries an extremely heavy burden when it attempts to justify a prior restraint on publication.10Justia. New York Times Co. v. United States, 403 US 713 (1971)
Press coverage also depends on access. Richmond Newspapers, Inc. v. Virginia (1980) recognized for the first time that the First Amendment implicitly guarantees the public and the press a right to attend criminal trials. Absent a compelling overriding interest supported by specific findings, criminal proceedings must remain open.11Library of Congress. Richmond Newspapers, Inc. v. Virginia
Student Speech in Public Schools
Students do not shed their First Amendment rights at the schoolhouse door. Tinker v. Des Moines Independent Community School District (1969) established the baseline. Three students had been suspended for wearing black armbands to protest the Vietnam War, and the Court held that officials can suppress student expression only if they can show it would cause a substantial disruption of the educational environment.12Justia. Tinker v. Des Moines Independent Community School District, 393 US 503 (1969) Without evidence of disruption, the discipline violates the First Amendment. Tinker is still the starting point more than fifty years later.
Protection narrows when the speech runs through school-sponsored channels. In Hazelwood School District v. Kuhlmeier (1988), a principal removed pages from the school newspaper covering student pregnancy and the effects of divorce. The Court upheld the removal: a school newspaper produced as part of the curriculum is not a public forum, and educators can exercise editorial control over school-sponsored activities as long as their decisions relate to legitimate educational goals.13Library of Congress. Hazelwood School District v. Kuhlmeier A political T-shirt worn in the hallway gets Tinker’s stronger protection; a student writing for the school paper gets Hazelwood’s weaker version.
Social media raised a newer question. Mahanoy Area School District v. B.L. (2021) involved a student who posted a profanity-laced Snapchat rant about her school’s cheerleading squad after failing to make varsity. The school suspended her from the junior varsity squad for a year. The Court ruled for the student. The First Amendment does not entirely bar schools from regulating off-campus speech, but it significantly limits that authority, for three reasons: off-campus expression normally falls under parental rather than school responsibility, combined on- and off-campus rules could silence a student completely, and schools themselves benefit from protecting unpopular student opinions.14Justia. Mahanoy Area School District v. B.L. Schools can still act on off-campus speech that causes genuine substantial disruption or involves threats or bullying, but weekend venting does not clear that bar.
Commercial and Corporate Speech
Advertising and other business-related expression receive First Amendment protection, though less than political speech. The framework comes from Central Hudson Gas and Electric Corp. v. Public Service Commission (1980), which set a four-part test. The speech must involve lawful activity and not be misleading; if it clears that threshold, the government must show its restriction serves a substantial interest, directly advances that interest, and is no more extensive than necessary.15Library of Congress. Central Hudson Gas and Electric Corp. v. Public Service Commission A regulation that fails any prong violates the First Amendment.
Compelled commercial disclosures are treated more leniently. Zauderer v. Office of Disciplinary Counsel (1985) upheld a requirement that an attorney disclose in his ads that clients would owe court costs even if they lost. The government can require businesses to include factual disclosures in advertising to prevent consumer deception, as long as the required information is factual, uncontroversial, and reasonably related to that interest.16Justia. Zauderer v. Office of Disc. Counsel That lower standard is why mandatory warnings, ingredient lists, and fee disclosures appear across so many industries.
Corporate speech reaches its most contested form in elections. Citizens United v. Federal Election Commission (2010) struck down the portion of federal campaign finance law that prohibited corporations and unions from spending their own funds on political broadcasts near elections.17Justia U.S. Supreme Court Center. Citizens United v. FEC The majority held that political speech is protected regardless of the speaker’s corporate identity, and that independent expenditures do not pose the same corruption risk as direct contributions. The ruling overturned prior precedent and opened the door to unlimited independent corporate and union spending on political advocacy.18Federal Election Commission. Citizens United v. FEC
Speech by Government Employees
If you work for a government agency, your First Amendment rights depend on whether you are speaking as a citizen or as part of your job. Garcetti v. Ceballos (2006) drew that line. A deputy district attorney wrote a memo to his supervisors arguing that a search warrant affidavit contained serious misrepresentations, and claimed he was demoted in retaliation. The Court ruled against him: when public employees make statements as part of their official duties, they are not speaking as citizens, and the First Amendment does not protect those communications from employer discipline.19Justia. Garcetti v. Ceballos A government worker writing an op-ed on their own time criticizing agency policy likely has protection. The same worker raising the same concerns in an internal report likely does not. Most government whistleblower claims that rely on the First Amendment fail at this step, which is why separate statutory whistleblower protections exist.
Online Speech and Social Media
The Court has treated the internet, and social media in particular, as central to modern public expression. Packingham v. North Carolina (2017) struck down a state law barring registered sex offenders from using social media sites, calling the statute “unprecedented in the scope of First Amendment speech it burdens.” The ruling described social media as something close to a modern public square, a place so central to contemporary life that the government needs strong justification to exclude anyone from it entirely.
Moody v. NetChoice (2024) took up a harder question. Florida and Texas had passed laws restricting how large social media platforms could filter user posts, arguing that dominant platforms’ moderation decisions amounted to censorship. The Court vacated the lower court rulings and sent the cases back for further analysis, but it made a pointed observation along the way: the Fifth Circuit’s conclusion that content moderation “is not speech at all” rested on a “serious misunderstanding of First Amendment precedent.”20Supreme Court of the United States. Moody v. NetChoice, LLC When a platform curates and organizes third-party content, that editorial process can itself be protected expression. The full scope of those protections remains open as the lower courts evaluate how broadly the state laws apply and whether each application violates the First Amendment.21Cornell Law Institute. Moody v. NetChoice, LLC
The Obscenity Exception
Obscene material receives no First Amendment protection, but the government cannot label something obscene because it is offensive or sexually explicit. Miller v. California (1973) set the controlling test. A jury must find all three of the following before material qualifies as legally obscene: the average person applying contemporary community standards would find the work appeals to a prurient interest in sex; the work depicts sexual conduct in a way that is patently offensive under applicable state law; and the work as a whole lacks serious literary, artistic, political, or scientific value.22Justia. Miller v. California Material with genuine artistic or political value stays protected even when graphic, and the community-standards element means the same content can be treated differently in different parts of the country. Applying Miller to internet content that crosses every community at once remains an unresolved tension.
Time, Place, and Manner Restrictions
Even fully protected speech can be regulated in when, where, and how it happens, as long as the government is not targeting the message. Ward v. Rock Against Racism (1989) laid out the standard. New York City required performers at a Central Park bandshell to use city-provided sound equipment and a city sound technician, a rule that applied to all performers regardless of their music or message. Content-neutral time, place, and manner restrictions are valid if they are narrowly tailored to serve a significant government interest and leave open alternative channels for the same expression.23Justia. Ward v. Rock Against Racism The government does not have to pick the least restrictive option; it simply cannot restrict substantially more speech than necessary.
Where you are speaking also matters. Courts sort government property into categories with different rules:
- Traditional public forums are places like parks, sidewalks, and public squares that have long been open to expression. Restrictions must survive strict scrutiny, meaning they must serve a compelling interest and be narrowly drawn.
- Designated public forums are spaces the government has voluntarily opened for public expression, such as university meeting rooms or municipal theaters. The government is not required to keep them open, but for as long as it does, speech gets the same protection as in traditional forums.
- Nonpublic forums are government properties not associated with public expression, such as military bases or internal mail systems. Restrictions need only be reasonable and viewpoint-neutral.
The category is decisive. A city can require protest marchers to obtain a permit and stay on a designated route through a public park, but it cannot deny the permit because it disagrees with the message. That distinction between regulating the logistics of speech and suppressing its content runs through nearly every First Amendment fight over public spaces.