During the late 1940s and early 1950s, the prospect of communist subversion at home and abroad seemed frighteningly real to many people in the United States. These fears came to define–and, in some cases, corrode–the era’s political culture. For many Americans, the most enduring symbol of this “Red Scare” was Republican Senator Joseph P. McCarthy of Wisconsin. Senator McCarthy spent almost five years trying in vain to expose communists and other left-wing “loyalty risks” in the U.S. government. In the hyper-suspicious atmosphere of the Cold War, insinuations of disloyalty were enough to convince many Americans that their government was packed with traitors and spies. McCarthy’s accusations were so intimidating that few people dared to speak out against him. It was not until he attacked the Army in 1954 that his actions earned him the censure of the U.S. Senate.