The event that started the Red Scare was when a Soviet defector turned over evidence that the Soviet Union was trying to infiltrate the U.S. government. Hence, Option C is right.
A term which is used to refer to two periods in the history of the United Nations. Promotion of widespread fear of communism, anarchism, or other leftist ideologies in the form of a state or society's potential rise.
Therefore, Option C, that a Soviet defector turned over evidence that the Soviet Union was trying to infiltrate the U.S. government, is right.
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