Brandenburg v. Ohio · ¶29

Out of the “clear and present danger” test came other offspring. Advocacy and teaching of forcible overthrow of government as an abstract principle is immune from prosecution. Yates v. United States, 354 U. S. 298, 318. But an “active” member, who has a guilty knowledge and intent of the aim to overthrow the Government by violence, Noto v. United States, 367 U. S. 290, may be prosecuted. Scales v. United States, 367 U. S. 203, 228. And the power to investigate, backed by the powerful sanction of contempt, includes the power to determine which of the two categories fits the particular witness. Barenblatt v. United States, 360 U. S. 109, 130. And so the investigator roams at will through all of the beliefs of the witness, ransacking his conscience and his innermost thoughts.

U. S. Reports, bound volume
U. S. Reports, volume 395, at 444 (Library of Congress) · transcription: Caselaw Access Project
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