Iron Curtain: The Iron Curtain was a term used to describe the ideological barrier that separated Eastern Europe (communist) from Western Europe (non-communist) during the Cold War.
HUAC Hearings: The HUAC hearings were conducted by the House Un-American Activities Committee to investigate alleged communist activities within various sectors in society.
Loyalty Oaths: Loyalty oaths were pledges required by certain organizations or institutions for individuals to declare their loyalty to the United States and disavow any association with communism.