J. Edgar Hoover labels the U.S. Communist Party a "fifth column if there ever was one," but stops short of calling for it to be outlawed. Hoover doesn't want to make martyrs out of communists and thinks that such a move would probably be ruled unconstitutional anyway.
Hoover explains during testimony to the House Committee on Un-American Activities:
"The Communist Party of the United States is a Fifth Column if there ever was one. It is far better organized than the Nazis... ... What can we do? And what should be our course of action? The best antidote to communism is vigorous, intelligent, old-fashioned Americanism, with eternal vigilance.
I do not favor any course of action which would give the communists cause to portray and pity themselves as martyrs. I do favor unrelenting prosecution wherever they are found to be violating our country's laws.
Communism is not a political party. It is a way of life - and evil and malignant way of life. It reveals a condition akin to disease that spreads like an epidemic and, like an epidemic, quarantine is necessary to keep it from infecting the nation.