President Truman vetoed the McCarran Internal Security Act:

Question

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President Truman vetoed the McCarran Internal Security Act because he felt it promoted thought control. He believed that the act would give the government too much power to investigate and monitor citizens without legitimate grounds for suspicion. He saw it as a threat to civil liberties and individual freedoms. This view was consistent with Truman's general commitment to protection of freedom of speech and expression.

President Truman Vetoed the McCarran Internal Security Act