"395 U.S. 444 (1969), argued 27 Feb. 1969, decided 9 June 1969 by unanimous vote; per curiam decision. Brandenburg v. Ohio was decided in the context of the significant expansion of First Amendment freedoms in the 1960s. It was the final step in the Supreme Court's tortuous fifty‐year development of a constitutional test for speech that advocates illegal action."
"In its various incarnations, the old clear and present danger test had permitted the punishment of speech if it had a “tendency” to encourage or cause lawlessness (Schenck v. U.S., 1919), or if the speech was part of a broader dangerous political movement, like the Communist party (Dennis v. U.S., 1951). (See Communism and Cold War.) The Brandenburg test, however, allowed government to punish the advocacy of illegal action only if “such advocacy is directed to inciting or producing imminent lawless action and is likely to incite or produce such action” (p. 447).
By requiring an actual empirical finding of imminent harm, this test protects the advocacy of lawlessness except in unusual instances. But government may still punish speech that is demonstrably dangerous. The test is also distinctly more objective than the old danger test. Brandenburg is the linchpin of the modern doctrine of free speech, which seeks to give special protection to politically relevant speech and to distinguish speech from action"
Brandenburg v. Ohio: Information from Answers.com
