What caused the red scare of the 1940s and 1950s?

As the Cold War between the Soviet Union and the United States intensified in the late 1940s and early 1950s, hysteria over the perceived threat posed by Communists in the U.S. became known as the Red Scare. The Red Scare led to a range of actions that had a profound and enduring effect on U.S. government and society.

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