Schenck v. United States, 249 U.S. 47 (1919) (U.S. Supreme Court)
Schenck v. United States is a foundational First Amendment case in which the Supreme Court, speaking through Justice Oliver Wendell Holmes, Jr., first articulated the "clear and present danger" test.
Does the First Amendment protect the distribution of anti-draft leaflets during wartime, or may the government criminalize such speech under the Espionage Act when it poses a clear and present danger of causing insubordination and obstructing military recruitment?
Speech is not absolutely protected; the government may punish expression that, "in such circumstances and [is] of such a nature as to create a clear and present danger" of bringing about substantive evils that Congress has a right to prevent. The permissibility of restricting speech depends on context—its proximity and degree to the threatened harm. As Justice Holmes stated: "The question in every case is whether the words used are used in such circumstances and are of such a nature as to create a clear and present danger that they will bring about the substantive evils that Congress has a right to prevent."
Affirmed. The defendants' convictions under the Espionage Act did not violate the First Amendment. In the context of wartime, distributing leaflets intended to obstruct the draft created a clear and present danger of substantive harm that Congress had authority to prevent.
Schenck is the starting point for modern First Amendment incitement and national security jurisprudence. It introduced the "clear and present danger" test, grounding constitutional analysis in context, proximity, and degree of harm. Although subsequent cases initially applied Schenck deferentially in wartime and sedition prosecutions (e.g., Debs, Frohwerk, Abrams), Holmes's subsequent dissent in Abrams and Justice Brandeis's writings pushed toward more protective standards. Over time, the Court shifted from Schenck's relatively elastic danger test to Dennis's "clear and probable danger" balancing and ultimately to Brandenburg v. Ohio's "imminent lawless action" test, which requires intent, imminence, and likelihood. While Schenck's holding has been narrowed and its reasoning superseded in key respects, it remains critical for understanding the development of First Amendment doctrine, the special pressures of wartime, and the enduring (and often misused) "falsely shouting fire in a theatre" analogy.