Answer:
The post-WWI Russian Revolution and communist administration had a major impact on American society. The "Red Scare" in the US stifled civil freedoms and persecuted communists. Many believed communist infiltrators were plotting to overthrow the government during this time. The Red Scare led to McCarthyism in the 1950s and shaped American politics and society.
Sources
The Russian Revolution: A Very Short Introduction by S. A. Smith
The Russian Revolution, 1917 by Rex A. Wade
The Russian Revolution: World War to Civil War, 1917-1921 by Jonathan D. Smele
The Russian Revolution by Richard Pipes
The Russian Revolution: A New History by Sean McMeekin