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The term ''Internal Security Act'' is often given to a piece of legislation laying down regulations that enable the executive government of a jurisdiction to preserve the internal security of the nation. In some jurisdictions, it authorizes the government to arrest and detain individuals without trial.

★ For Israeli legislation, see 'Administrative detention'.

★ For Malaysian legislation, see 'Internal Security Act (Malaysia)'.

★ For Singapore legislation, see 'Internal Security Act (Singapore)'.

★ For United States legislation, see 'McCarran Internal Security Act'.