During the McCarthy Era of the 1950s, the Supreme Court ruled in Dennis v. United States that a citizen's membership in the Communist Party constituted a clear and present danger to the nation.

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This statement is true. The Supreme Court's decision in Dennis v. United States in 1951 upheld the conviction of Communist Party leaders under the Smith Act, ruling that their advocacy for the violent overthrow of the government posed a clear and present danger to national security. This decision was made during the height of the McCarthy Era, a period of intense anti-communist sentiment in the United States.