Shouting fire in a crowded theater in the context of Schenck v. United States

Speech crimes are certain kinds of speech that are criminalized by promulgated laws or rules. Criminal speech is a direct preemptive restriction on freedom of speech, and the broader concept of freedom of expression.

Laws vary by country in accordance with the legal principles that form the basis of their system of jurisprudence. Prohibitions on shouting fire in a crowded theater (as a practical joke, not as a warning) are not considered controversial in any country, given the potential for imminent harm.

Oliver Wendell Holmes Jr. (March 8, 1841 – March 6, 1935) was an American jurist who served as an associate justice of the U.S. Supreme Court from 1902 to 1932. Holmes is one of the most widely cited and influential Supreme Court justices in American history, noted for his long tenure on the Court and for his pithy opinions – particularly those on civil liberties and American constitutional democracy – and deference to the decisions of elected legislatures. Holmes retired from the Court at the age of 90, an unbeaten record for oldest justice on the Supreme Court. He previously served the Union as a brevet colonel in the American Civil War (in which he was wounded three times), as an associate justice and chief justice of the Massachusetts Supreme Judicial Court, and as Weld Professor of Law at his alma mater, Harvard Law School. His positions, distinctive personality, and writing style made him a popular figure, especially with American progressives.

During his tenure on the U.S. Supreme Court, to which he was appointed by President Theodore Roosevelt in 1902, he supported the constitutionality of state economic regulation and came to advocate broad freedom of speech under the First Amendment, after, in Schenck v. United States (1919), having upheld for a unanimous court criminal sanctions against draft protestors with the memorable maxim that "free speech would not protect a man in falsely shouting fire in a theatre and causing a panic" and formulating the groundbreaking "clear and present danger" test. Later that same year, in his famous dissent in Abrams v. United States (1919), he wrote that "the best test of truth is the power of the thought to get itself accepted in the competition of the market. ... That, at any rate, is the theory of our Constitution. It is an experiment, as all life is an experiment." He added that "we should be eternally vigilant against attempts to check the expression of opinions that we loathe and believe to be fraught with death...."