This old canard, a favourite reference of censorship apologists, needs to be retired. It’s repeatedly and inappropriately used to justify speech limitations. The phrase is a misquotation of an analogy made in 1919 Supreme Court opinion that upheld the imprisonment of three people—a newspaper editor, a pamphlet publisher and a public speaker—who argued that military conscription was wrong. The court said that anti-war speech in wartime is like “falsely shouting fire in a theatre and causing a panic,” and it justified the ban with a dubious analogy to the longstanding principle that the First Amendment doesn’t protect speech that incites people to physical violence. But the Supreme Court abandoned the logic of that case more than 50 years ago. That this trope originated as a justification for what has long since been deemed unconstitutional censorship reveals how useless it is as a measure of the limitations of rights. And yet, the crowded theatre cliché endures, as if it were some venerable legal principle.

Justice Holmes’ famous quote comes in the context of a series of early 1919 Supreme Court decisions in which he endorsed government censorship of wartime dissent — dissent that is now clearly protected by subsequent First Amendment authority. Socialist Party of America chair Charles Schenck was prosecuted and imprisoned under the Espionage Act.

After Holmes’ opinion in the Schenck case, the law of the United States was this: you could be convicted and sentenced to prison under the Espionage Act if you criticized the war, or conscription, in a way that “obstructed” conscription, which might mean as little as convincing people to write and march and petition against it. This is the context of the “fire in a theater” quote that people so love to brandish to justify censorship.

Oh, and notice that the court’s objection was only to "falsely shouting fire!”: if there is, in fact, a fire in a crowded theatre, please let everyone know.