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Military counterintelligence departments of the Soviet Armed Forces existed in all larger military formations, each called a Special Department (Russian: Особый отдел (ОсО)) or third department/section. The staff of the Special Department would usually establish a secret network of informants.
TGU (ТГУ КГБ СССР, 3 ГУ КГБ СССР ('third')) functionaries were responsible for protection of the military units and of important servicemen (e.g. commanding officers) against activities of foreign military attaché offices/diplomats.
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