Answer
The House Un-American Activities Committee (HUAC) targeted Welles during the post-war "red scare" because of his leftist political views. Welles was accused of being a communist sympathizer, and his films were criticized for being subversive and anti-American. In 1947, Welles was called to testify before HUAC, but he refused to answer their questions about his political beliefs. As a result, Welles was blacklisted in Hollywood, and his career suffered.