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KGB, foreign intelligence and domestic security agency of the Soviet Union. During the Soviet era the KGB’s responsibilities also included the protection of the country’s political leadership, the supervision of border troops, and the general surveillance of the population. Established in 1954, the KGB was the most durable of a series of security agencies starting with the Cheka, which was established in December 1917 in the first days of the Bolshevik government. The Cheka (originally...