What caused the Red Scare after World War II?

Question

The U.S. government wanted to monitor the activities of anyone with left-leaning political beliefs.
The U.S. government wanted to end opposition to the war in Vietnam quickly.
The U.S. government wanted to prevent spying by the Soviet Union during the Cold War.
The U.S. government wanted to weaken groups with right-leaning political beliefs.

Answer 1

The primary cause of the Red Scare after World War II was the U.S. government's desire to prevent spying by the Soviet Union during the Cold War. This period was marked by intense fear and suspicion of communism, driven by geopolitical tensions between the United States and the Soviet Union, as well as domestic fears of communist infiltration in the government and society. The rise of Joseph McCarthy and others who sought to expose alleged communists further fueled this atmosphere of fear and suspicion.