Why Not one more?
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McCarran Internal Security Act
>The Internal Security Act of 1950, 64 Stat. 987 (Public Law 81-831), also known as the Subversive Activities Control Act of 1950, the McCarran Act after its principal sponsor Sen. Pat McCarran (D-Nevada), or the Concentration Camp Law,[2] is a United States federal law. Congress enacted it over President Harry Truman's veto. It required Communist organizations to register with the federal government. The emergency detention provision was repealed when the Non-Detention Act of 1971 was signed into law by President Richard Nixon.▪Long title
An Act to protect the United States against certain un-American and subversive activities by requiring registration of Communist organizations, and for other purposes.
https://en.m.wikipedia.org/wiki/McCarran_Internal_Security_Act 