Answer:
a. Communists.
Explanation:
Joseph McCarthy was a senator from the state of Wisconsin from 1947 to 1957 and he is known for the practices and false accusations he adopted in the name to curb communism in the United States. he blamed common people, actors and people from within the government for spreading anti-national and communist ideas in the country. However, his allegations were not supported by evidence and threat his used pressurize people soon lost strength in the United States.