Subversive activities -- Foreign relations -- 3 Communism -- 2 History -- 2 Internal security -- 2 Anti-communist movements -- 1 Civil rights -- 1 more ... Communist parties -- 1 Congresses -- 1 Congresses. -- 1 Detention of persons -- 1 Espionage, Soviet -- 1 Government policy -- 1 Intelligence service -- 1 Internal security lawa and legislation -- 1 Secret service -- 1 Terrorism 1 Terrorism -- 1 Underground movements 1 World War, 1939-1945 -- 1 less ...