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Supreme Court · Decisions

Cox v. Louisiana

The Court held that a state government cannot employ "breach of the peace" statutes against protesters engaging in peaceable demonstrations that may potentially incite violence.

379 U.S. 536 · No. 24 · 1964 term · Warren Court

Decided Jan 18, 1965 · argued Oct 21, 1964

First Amendment · Protest demonstrations: demonstrations and other forms of protest based on First Amendment guarantees

Struck down a state law

Majority opinion: Arthur Goldberg

The voteMajority

9–09 in the majority, 0 in dissent

No dissent (9–0)

Reversed. Cox won.

What this ruling means

Reversed: the Supreme Court overturned the decision of the Louisiana Supreme Court, and its own ruling ends the case.

Cox was the petitioner, the side that asked the Supreme Court to review the case. “Won” means the Court gave that side the result it asked for.

From the Supreme Court Database. A justice who agreed with the result but not the reasoning counts in the majority.

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Summary

The opening of the case’s Wikipedia article: what the case was about and what the Court held.

Cox v. Louisiana, 379 U.S. 536 (1965), is a United States Supreme Court case based on the First Amendment to the U.S. Constitution. It held that a state government cannot employ "breach of the peace" statutes against protesters engaging in peaceable demonstrations that may potentially incite violence.

Read the full article on Wikipedia

Data notes

The text is Wikipedia’s (CC BY-SA 4.0), matched to the case by its citation, docket number or name and year, and is not checked against the opinion. The site keeps the article’s opening section, ending on its last full sentence. The one-sentence summary under the title is the Decisions list’s: Wikipedia’s own ruling sentence, or, tagged “AI-written”, one Claude wrote from this opening.

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How the justices voted

Each justice who took part, placed by their Martin–Quinn ideology score for the 1964 term. Filled: the 9 in the majority. Hollow: the 0 in dissent. Colour is the party of the president who appointed them.

More liberalMore conservativeMedianDouglasWarrenBrennanBlackGoldbergWhiteClarkStewartHarlan

Majority(9)

Dissent(0)

  • None.
Data notes

Each justice’s vote and what they wrote are from the justice-centered file of the Supreme Court Database. “Wrote a concurrence” means the justice sided with the majority and wrote separately; a justice who dissented in part is counted on the side they took overall. A justice who wrote nothing is listed as joining their side.

Positions are each justice’s Martin–Quinn score for the case’s term, the same scores as the Ideology page: negative is more liberal, positive more conservative. A score sums up a justice’s votes across the whole term, so it says where they usually sit, not why they voted as they did here. The median line is the Court’s median justice that term.

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The parties

Who brought the case to the Court, who answered it, and how it got there.

Petitioner
CoxPerson or organization protesting racial or ethnic segregation or discrimination
Respondent
LouisianaState (Louisiana)
Reached the Court by
Appeal (the Court was required to hear it)
Data notes

The names are the two sides of the case’s title. The description under each is the Supreme Court Database’s category for that party, in its own wording. The petitioner is the side that asked the Supreme Court to review the decision below. “Why it was taken” appears only when the majority opinion says lower courts disagreed or were unsure about the question; reasons that would fit any case (“to resolve the question presented”, “an important question”) are left out.

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The law at issue

The law the Court was asked to apply, and the kind of power it used to decide.

Provision
First Amendment (speech, press, and assembly)
Kind of law
Constitutional Amendment
Decided by
Judicial review (state level)
Struck down
A state law, as unconstitutional
Data notes

The Supreme Court Database codes the main constitutional provision, statute or court rule each case turned on, and the basis of the decision: judicial review of a federal or state law, interpreting a statute, supervising the lower courts, and so on. A case can rest on more than one. “Overruled” counts only where the majority opinion says so.

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Timeline

What happened at the Court and how the case got there, newest first.

  1. Jan 18, 1965DecidedDecided · Decided 9–0: reversed. Cox won.
  2. Oct 21, 1964ArguedArgued · Oral argument before the Court.
  3. Not datedTaken upTaken up · Reached the Supreme Court on appeal, which the Court had to hear.
  4. Not datedCourt belowCourt below · Decided by the Louisiana Supreme Court: affirmed.
  5. Not datedBeganBegan · The case began in the Louisiana trial court.
Data notes

From the Supreme Court Database: the court the case began in, the court whose decision the Supreme Court reviewed and what that court did, how the case came to the Court, and the dates of argument and decision. The database does not date the steps in the lower courts. Court names are the database’s.

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Other decisions on the same issue

46 other argued cases since 1946 on protest demonstrations: demonstrations and other forms of protest based on First Amendment guarantees, newest first.

  1. Olivier v. City of Brandon, Mississippi607 U.S. 552Mar 20, 2026 · 607 U.S. 552First Amendment9–0Unanimous band

  2. O'Connor-Ratcliff v. Garnier601 U.S. 205Mar 15, 2024 · 601 U.S. 205First Amendment9–0Unanimous band

  3. Lindke v. Freed601 U.S. 187Mar 15, 2024 · 601 U.S. 187First Amendment9–0Unanimous band

  4. Wood v. Moss572 U.S. 744May 27, 2014 · 572 U.S. 744First Amendment9–0Unanimous band

  5. Albert Snyder, Petitioner v. Fred W. Phelps, Sr., et al.Landmark · Freedom of speech and of the press562 U.S. 443Mar 2, 2011 · 562 U.S. 443First Amendment8–18–1 band

  6. Deborah Morse, et al. v. Joseph Frederick551 U.S. 393Jun 25, 2007 · 551 U.S. 393First Amendment5–45–4 band

  7. Virginia v. Barry Elton Black, Richard J. Elliott, and Jonathan O'MaraLandmark · Freedom of speech and of the press538 U.S. 343Apr 7, 2003 · 538 U.S. 343First Amendment7–27–2 band

  8. John J. Hurley and South Boston Allied War Veterans Council v. Irish-American Gay, Lesbian and Bisexual Group of Boston, etc., et al.Landmark · Freedom of association515 U.S. 557Jun 19, 1995 · 515 U.S. 557First Amendment9–0Unanimous band
  9. Rav v. City of St. Paul, MinnesotaLandmark · Freedom of speech and of the press505 U.S. 377Jun 22, 1992 · 505 U.S. 377First Amendment9–0Unanimous band

  10. United States v. Shawn D. Eichman, David Gerald Blalock and Scott W. Tyler496 U.S. 310Jun 11, 1990 · 496 U.S. 310First Amendment5–45–4 band

  11. Federal Trade Commission v. Superior Court Trial Lawyers Association et al.493 U.S. 411Jan 22, 1990 · 493 U.S. 411First Amendment6–36–3 band
  12. Texas v. JohnsonLandmark · Freedom of speech and of the press491 U.S. 397Jun 21, 1989 · 491 U.S. 397First Amendment5–45–4 band

  13. Michael Boos, J. Michael Waller and Bridget Brooker v. Marion S. Barry, Jr., Mayor, District of Columbia, et al.485 U.S. 312Mar 22, 1988 · 485 U.S. 312First Amendment5–36–3 band

  14. City of Houston, Texas v. Hill482 U.S. 451Jun 15, 1987 · 482 U.S. 451First Amendment8–18–1 band
  15. United States v. Albertini472 U.S. 675Jun 24, 1985 · 472 U.S. 675First Amendment6–36–3 band

  16. Clark, Secretary of the Interior, et al. v. Community for Creative Non-Violence et al.468 U.S. 288Jun 29, 1984 · 468 U.S. 288First Amendment7–27–2 band

  17. National Association for the Advancement of Colored People et al. v. Claiborne Hardware Co. et al.Landmark · Freedom of speech and of the press458 U.S. 886Jul 2, 1982 · 458 U.S. 886First Amendment8–0Unanimous band

  18. Carey, State's Attorney of Cook County v. Brown et al.447 U.S. 455Jun 20, 1980 · 447 U.S. 455First Amendment6–36–3 band

  19. Spence v. Washington418 U.S. 405Jun 25, 1974 · 418 U.S. 405First Amendment6–36–3 band

  20. Smith, Sheriff v. Goguen415 U.S. 566Mar 25, 1974 · 415 U.S. 566First Amendment6–36–3 band

  21. Lewis v. City of New Orleans415 U.S. 130Feb 20, 1974 · 415 U.S. 130First Amendment6–36–3 band
  22. Grayned v. City of Rockford408 U.S. 104Jun 26, 1972 · 408 U.S. 104First Amendment9–0Unanimous band
  23. Police Department of the City of Chicago et al. v. Mosley408 U.S. 92Jun 26, 1972 · 408 U.S. 92First Amendment9–0Unanimous band

  24. Colten v. Kentucky407 U.S. 104Jun 12, 1972 · 407 U.S. 104First Amendment7–27–2 band
  25. Gooding, Warden v. Wilson405 U.S. 518Mar 23, 1972 · 405 U.S. 518First Amendment5–27–2 band
  26. Cohen v. CaliforniaLandmark · Freedom of speech and of the press403 U.S. 15Jun 7, 1971 · 403 U.S. 15First Amendment5–45–4 band

  27. Coates et al. v. City of Cincinnati402 U.S. 611Jun 1, 1971 · 402 U.S. 611First Amendment5–45–4 band

  28. Radich v. New York401 U.S. 531Mar 24, 1971 · 401 U.S. 531First Amendment4–45–4 band
  29. Schacht v. United States398 U.S. 58May 25, 1970 · 398 U.S. 58First Amendment8–0Unanimous band

  30. Bachellar et al. v. Maryland397 U.S. 564Apr 20, 1970 · 397 U.S. 564First Amendment8–0Unanimous band
  31. Jones v. State Board of Education of Tennessee et al.397 U.S. 31Feb 24, 1970 · 397 U.S. 31First Amendment6–27–2 band
  32. Street v. New York394 U.S. 576Apr 21, 1969 · 394 U.S. 576First Amendment5–45–4 band

  33. Shuttlesworth v. City of Birmingham394 U.S. 147Mar 10, 1969 · 394 U.S. 147First Amendment8–0Unanimous band

  34. Tinker et al. v. Des Moines Independent Community School District et al.Landmark · Freedom of speech and of the press393 U.S. 503Feb 24, 1969 · 393 U.S. 503First Amendment7–27–2 band
  35. United States v. O'BrienLandmark · Freedom of speech and of the press391 U.S. 367May 27, 1968 · 391 U.S. 367First Amendment7–18–1 band

  36. Cameron et al. v. Johnson, Governor of Mississippi, et al.390 U.S. 611Apr 22, 1968 · 390 U.S. 611First Amendment7–27–2 band
  37. Walker et al. v. City of Birmingham388 U.S. 307Jun 12, 1967 · 388 U.S. 307First Amendment5–45–4 band
  38. Turner et al. v. New York386 U.S. 773May 8, 1967 · 386 U.S. 773First Amendment7–27–2 band
  39. Adderley et al. v. Florida385 U.S. 39Nov 14, 1966 · 385 U.S. 39First Amendment5–45–4 band
  40. National Association for the Advancement of Colored People et al. v. Overstreet384 U.S. 118Apr 27, 1966 · 384 U.S. 118First Amendment5–45–4 band
  41. Shuttlesworth v. City of Birmingham382 U.S. 87Nov 15, 1965 · 382 U.S. 87First Amendment9–0Unanimous band

  42. Cox v. Louisiana379 U.S. 559Jan 18, 1965 · 379 U.S. 559First Amendment5–45–4 band

  43. Fields et al. v. City of Fairfield.375 U.S. 248Dec 16, 1963 · 375 U.S. 248First Amendment9–0Unanimous band
  44. Edwards et al. v. South CarolinaLandmark · Freedom of petition372 U.S. 229Feb 25, 1963 · 372 U.S. 229First Amendment8–18–1 band

  45. Hughes et al. v. Superior Court of California for Contra Costa County339 U.S. 460May 8, 1950 · 339 U.S. 460First Amendment8–0Unanimous band
  46. Kovacs v. Cooper, Judge336 U.S. 77Jan 31, 1949 · 336 U.S. 77First Amendment5–45–4 band
Data notes

Every other orally argued case with a clear vote, from the 1946 term on, that the Supreme Court Database files under the same issue as this one. The database gives each case one issue from a list of about 270 (abortion, search and seizure of vehicles, the death penalty, and so on), whatever law it turned on.

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Official record

Read the full opinion on Justia, the argument audio on Oyez and Wikipedia. Case data from the Supreme Court Database, Version 2026 Release 01, through the 2025 term.