Supreme Court Decision
Dennis v. United States
Upheld the conviction of 11 Commies under the Smith Act, making it illegal to belong to an organization advocating the violent overthrow of the government.
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Other decisions pertaining to Free Association:
Boy Scouts of America v. Dale [530 U.S. 640 (2000)] Rehnquist Court
NAACP v. Patterson [357 U.S. 449 (1958)] Warren Court