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"Defend the Realm" reveals the precise role of the Security Service in twentieth-century British history, from its foundation by Captain Kell of the British Army in October 1909, through two world wars, up to and including its present roles in counterespionage and counterterrorism

Intelligence service --- Service des renseignements --- History --- Histoire --- Great Britain. --- Service des renseignementsHistory --- HistoireGreat Britain.History --- History. --- UK Security Service --- Imperial Security Intelligence Service (England) --- MI5 --- Counter intelligence --- Counterespionage --- Counterintelligence --- Intelligence community --- Secret police (Intelligence service) --- Public administration --- Research --- Disinformation --- Secret service

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Delcassé, Théophile, --- France --- Foreign relations --- Relations extérieures

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USSR. KGB --- INTELLIGENCE SERVICE--USSR --- USSR--FOREIGN RELATIONS--DEVELOPING COUNTRIES --- DEVELOPING COUNTRIES--FOREIGN RELATIONS--USSR

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Intelligence service --- World politics --- Service des renseignements --- Politique mondiale --- History --- Histoire

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World War, 1914-1918 --- Première guerre mondiale --- Diplomatic history --- Histoire diplomatique --- France --- Great Britain --- Grande-Bretagne --- Politics and government --- Colonies --- History --- Foreign relations --- Politique et gouvernement --- Histoire --- Relations extérieures