Final answer:
During the 1930s, some American liberals embraced communism as an alternative to fascism, but being a member of the Communist Party was never illegal for U.S. citizens. The Roosevelt administration implemented socialist policies in response to the Great Depression, which fostered an environment where communism flourished. However, with the rise of the Soviet Union and concerns about oppression, Westerners began to reject communism.
Step-by-step explanation:
During the 1930s, the Great Depression led some American liberals to embrace communist beliefs as an alternative to fascism. However, it was never illegal for a U.S. citizen to be a member of the Communist Party. The Roosevelt administration implemented a number of socialist policies to combat the economic crisis, which created an atmosphere where communism thrived. After World War II, Westerners turned against communism due to the rise of the Soviet Union and concerns about oppression and slavery.