The hunt for Communists in the United States clearly reached the point of hysteria by the early 1950s, but what is often overlooked is that it had its origins in a very real phenomenon. This lesson will expose students to recently declassified FBI documents and transcripts of the Rosenberg trial. It will encourage them to think seriously about the extent of the Soviet espionage network in America, thus setting the stage for a proper understanding of later hearings by the House Un-American Activities Committee and Joseph McCarthy.