In 1950, fewer than 50,000 Americans out of a total US population of 150 million were members of the Communist Party. Yet in the late 1940s and early 1950s, American fears of internal communist subversion reached a nearly hysterical pitch. Government loyalty boards investigated millions of federal employees, asking what books and magazines they read, what unions and civic organizations they belonged to, and whether they went to church. Hundreds of screenwriters, actors, and directors were blacklisted because of their alleged political beliefs, while teachers, steelworkers, sailors, lawyers, and social workers lost their jobs for similar reasons. More than thirty-nine states required teachers and other public employees to take loyalty oaths. Meanwhile, some libraries pulled books that were considered too leftist from their shelves. The banned volumes included such classics as Robin Hood, Henry David Thoreau’s Civil Disobedience, and John Steinbeck’s The Grapes of Wrath.
The post-war Red Scare is often called “McCarthyism,” a name derived from one of the era’s most notorious anti-Communists, Senator Joseph McCarthy. Yet the anti-Communist crusade of the late 1940s and 1950s extended both in time and scope well beyond the activities of the junior senator from Wisconsin. Its roots can be traced to the mid-nineteenth century. As far back as 1848, when Karl Marx published the Communist Manifesto, many Americans viewed communism as an alien ideology. The Bolshevik Revolution only added to such anxieties, fuelling an earlier Red Scare in 1919.
Post-war anti-Communism was rooted even more directly in the political culture of the 1930s. During the Depression, many Americans became disillusioned with capitalism and some found communist ideology appealing. Others were attracted by the visible activism of American Communists on behalf of a wide range of social and economic causes, including the rights of African Americans, workers, and the