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The McCarran Internal Security Act denies entry to Communist Party members.

1950

LLP
IM

The act makes Communist Party membership grounds for deportation or refusal of entry to the United States.

The act has three main components: 1) all organizations determined to be communist must register with the U.S. Department of Justice and provide membership lists and financial information; 2) it is a felony to support the emergence of a totalitarian regime in the United States in any way; and 3) it authorizes the president to arrest or detain anyone suspected of espionage.