President Truman vetoed the McCarran Internal Security Act:

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President Truman vetoed the McCarran Internal Security Act because he believed that it promoted thought control and went against the principles of freedom of thought and expression that were important to the United States. He believed that the Act's provisions requiring the registration of Communists and other subversive individuals with the government were reminiscent of totalitarian regimes and could lead to the persecution of innocent people. Truman also saw the Act as a tool for political repression and believed that it would erode the government's legitimacy and its ability to respond to real threats to national security.

President Truman Vetoed the McCarran Internal Security Act