"Shouting fire in a crowded theater" is a misquote that refers to Oliver Wendell Holmes, Jr.'s opinion in the United States Supreme Court case Schenck v. United States in 1919 and that is used to express the limits upon which free speech may be expressed under the terms of the First Amendment of the United States Constitution.
Holmes, writing for a unanimous majority, ruled that it was illegal to distribute fliers opposing the draft during World War I. Holmes argued this abridgment of free speech was permissible because it presented a "clear and present danger" to the government's recruitment efforts for the war. Holmes wrote:
Holmes wrote of falsely shouting fire, because, of course, if there were a fire in a crowded theater, one may rightly indeed shout "Fire!". Falsely shouting "Fire!" in a crowded theater, i.e. shouting "Fire!" when one believes there to be no fire in order to cause panic, was interpreted not to be protected by the First Amendment.
Schenck was later overturned by Brandenburg v. Ohio, which ruled that speech could only be banned when it was directed to and likely to incite imminent lawless action (e.g. a riot), the test which remains until this day. Some now see the Schenck argument to be mistaken, contending that the pamphleteer's actions were more like yelling fire outside a building to prevent people from entering, rather than trying to encourage people to stampede out.
Despite Schenck being overturned, the phrase "shouting fire in a crowded theater" has since come to be known as synonymous with an action that the speaker believes goes beyond the rights guaranteed by free speech, reckless or malicious speech, or an action whose outcomes are blatantly obvious.
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