Loading ...Both world wars raised concerns in Congress about subversive threats to the nation. As tensions rose between the United States and the Soviet Union following World War II, the House Un-American Activities Committee (HUAC) conducted prominent hearings to investigate allegations that communists disloyal to the United States had infiltrated the government, the entertainment industry, and other organizations. While critics complained that HUAC’s investigations trampled on citizens’ rights, supporters believed the committee’s actions were justified, given threats to national security at the time.