Question

The Red Scare of 1920s was fueled by the fear that

Answer 1

At its height in 1919–1920, concerns over the effects of radical political agitation in American society and the alleged spread of communism and anarchism in the American labor movement fueled a general sense of concern.

Step-by-step explanation:

Answer 2

The first red scare was fueled by the fear of far-left extremism.

Several Russian immigrants were arriving in the United States because of the Bolshevik Revolution. Many of them had "communist" ideas, and the US was scared that the same violence and anarchy that was occuring in Russia, would happen there in the US. The Attroney General, A. Mitchell Palmer, conducted several raids, seeking out those radicals.

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On April 15, 1921, two employees, Nicola Sacco and Bartolomeu Vanzetti were arrested for murder and robbery. The two maintained their innocence in the trial, however, they were anarchists, so, this did not help their case. They were found guility in less than two weeks after their arrest, and put to death on the 27th.