Long involved in liberal politics, Garfield was caught up in the communist scare of the late 1940s and early 1950s. He supported the Committee for the First Amendment, which opposed governmental investigation of political beliefs. When called to testify before the House Committee on Un-American Activities, which was empowered to investigate communist infiltration in America, Garfield refused to name communist party members or followers, testifying that, indeed, he knew none in the film industry. Garfield rejected communism, and just prior to his death in hopes of redeeming himself in the eyes of the blacklisters, wrote that he had been duped by communist ideology in an unpublished article called "I Was a Sucker for a Left Hook", a reference to Garfield's movies about boxing. However, his forced testimony before the committee had severely damaged his reputation. He was blacklisted in Red Channels, and barred from Future employment as an actor by Hollywood movie studio bosses for the remainder of his career.