McCarthyism: A term used to describe the practice of making accusations of subversion or treason without proper evidence, often associated with Senator Joseph McCarthy.
Alger Hiss: A former U.S. State Department official who was accused by Whittaker Chambers of being a Soviet spy and convicted of perjury.
Hollywood Ten: A group of ten writers, directors, and producers who were cited for contempt of Congress after refusing to answer questions about their alleged involvement with the Communist Party.