Gilder Lehrman Institute of American History
Gilder Lehrman Institute: History Now: Anti Communism in the 1950s
[Free Registration/Login Required] An essay tracing the anti-Communist hysteria beginning in earnest at the end of World War II that resulted in Truman's federal Loyalty Security program and ending with McCarthyism in the 1950s.
Federation of American Scientists
Fas: Counter Intelligence in World War Ii: Chapter 1
Provides information on Igor Sergeyevich Guzenko, the postwar expansion of FBI domestic intelligence, the Federal Loyalty-Security Program, and the FBI-Military Intelligence Jurisdictional Agreement.