The clear-and-present-danger doctrine is a freedom of speech doctrine first announced by the U.S. Supreme Court in Schenck v. United States, 249 U.S. 47, 39 S. Ct. 247, 63 L. Ed. 470 (1919), during a controversial period in U.S. history when the First Amendment often clashed with the government's interest in maintaining order and morale during wartime. Various formulations of the doctrine have appeared in other significant Supreme Court decisions throughout the years.

pulling the plug on the tubes?