How would the threat of nuclear attacks increase the fear of the "Red Scare?

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Explanation:

The Red Scare was the fear of communism. America and the Soviet Union came out as two world powers after WW2, holding the most amount of nuclear weaponry. They were the two opponents(not including any satellite states or colonies) of the Cold War, and had opposing economic ideas, America supporting capitalism and the Soviet Union supporting Communism. Going back to the high amounts of nuclear weaponry on both sides, since there were such alarming amounts people around the world were in fear of nuclear warfare, especially those in America. American citizens often believed that the Soviet Union would strike America and attack with nuclear bombs, which increased the presence of the Red Scare.

from the conditions of the working class in england by friedrich engels,the main idea is :

they wanted the u.s. to fight on the side of the central powers.