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Red Scare.
The Julius and Ethel Rosenberg cases were an enormous factor in increasing fear of Communism in the US , as well as the Alger Hiss case .
McCarthyism
Red scare
fear of communism in the us after the bolshevik revolution
It was the fear that communism would envelope the world.
Look in your history book
America was actively fighting Communism as early as 1919 in the Russian Civil War. The fear of communism does not stem from the Soviet Union, it stems from what communism represents. There was no great event that started the fear of communism, made clear by the fact that in 1919 the Bolsheviks were yet to actually do that many great evils.
The Red Scare.
A fear of Russia that ran high in the US even after the Bolshevik revolution of 1917. This resulted in a nationwide crusade against those whose support Communism.
Both were started because of the US fear of communism.
Fear of communism