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-- See Also the narrower term Espionage

--subdivision Secret service under names of wars, etc., e.g. World War, 1939-1945--Secret service; United States--History--Civil War, 1861-1865--Secret service

-- See Also Internal security

-- See Also the narrower term Labor unions and communism

-- See Also Political crimes and offenses

-- See Also the narrower term Sabotage

-- See Also the narrower term Sedition

-- See Also the narrower term Spies

--subdivisions Secret service and Underground movements under individual wars, e.g. World War, 1939-1945--Secret service; World War, 1939-1945--Underground movements

-- See Also the narrower term Terrorism

-- See Also the narrower term Treason

--subdivision Collaborationists under individual wars, military occupations and history of a country under foreign rule, e.g. World War, 1939-1945--Collaborationists; Korea--History--Japanese occupation, 1910-1945--Collaborationists