GRU (Soviet Union)

Main Intelligence Directorate (Russian: Главное разведывательное управление, romanized: Glavnoye razvedyvatel'noye upravleniye, IPA: [ˈglavnəjə rɐzˈvʲɛdɨvətʲɪlʲnəjə ʊprɐˈvlʲenʲɪjə]), abbreviated GRU (Russian: ГРУ, IPA: [ɡɨ̞‿rɨ̞‿ˈu], [gru]), was the foreign military intelligence agency of the General Staff of the Soviet Armed Forces until 1991. For a few months it was also the foreign military intelligence agency of the newly established Russian Federation until 7 May 1992 when it was dissolved and the Russian GRU took over its activities.
The GRU's first predecessor in Russia formed on October 21, 1918 by secret order under the sponsorship of Leon Trotsky (then the civilian leader of the Red Army), signed by Jukums Vācietis, the first commander-in-chief of the Red Army (RKKA), and by Ephraim Sklyansky, deputy to Trotsky; it was originally known as the Registration Directorate (Registrupravlenie, or RU). Semyon Aralov was its first head. In his history of the early years of the GRU, Raymond W. Leonard writes:
The first head of the 4th Directorate was Yan Karlovich Berzin, a Latvian Communist and former member of the Cheka, who served until 1935 and again in 1937. He was arrested in May 1938 and subsequently murdered in July 1938 during the so-called "Latvian Operation" of Joseph Stalin's Great Purge.
The GRU in its modern form was created by Stalin in February 1942, less than a year after the invasion of the Soviet Union by Nazi Germany. From April 1943 the GRU handled human intelligence exclusively outside the USSR.
The GRU had the task of handling all military intelligence, particularly the collection of intelligence of military or political significance from sources outside the Soviet Union. It operated rezidenturas (residencies) all over the world, along with the signals intelligence (SIGINT) station in Lourdes, Cuba, and throughout the Soviet-bloc countries.
The GRU was known in the Soviet government for its fierce independence from the rival "internal intelligence organizations", such as the Main Directorate of State Security (GUGB), State Political Directorate (GPU), MGB, OGPU, NKVD, NKGB, KGB and the First Chief Directorate (PGU). At the time of the GRU's creation, Lenin infuriated the Cheka (the predecessor of the KGB) by ordering it not to interfere with the GRU's operations.
Nonetheless, the Cheka infiltrated the GRU in 1919. That worsened a fierce rivalry between the two agencies, which were both engaged in espionage. The rivalry became even more intense than that between the Federal Bureau of Investigation and Central Intelligence Agency in the US.
The existence of the GRU was not publicized during the Soviet era, but documents concerning it became available in the West in the late 1920s, and it was mentioned in the 1931 memoirs of the first OGPU defector, Georges Agabekov, and described in detail in the 1939 autobiography of Walter Krivitsky (I Was Stalin's Agent), who was the most senior Red Army intelligence officer ever to defect. It became widely known in Russia, and in the West outside the narrow confines of the intelligence community, during perestroika, in part thanks to the writings of "Viktor Suvorov" (Vladimir Rezun), a GRU officer who defected to Great Britain in 1978 and wrote about his experiences in the Soviet military and intelligence services. According to Suvorov, even the General Secretary of the Communist Party of the Soviet Union, when entering the GRU headquarters, needed to go through a security screening. In Aquarium Suvorov alleges that during his training and service he was often reminded that exiting the GRU (retiring) was only possible through "The Smoke Stack". This was a GRU reference to a training film shown to him, in which he alleges he watched a condemned agent being burned alive in a furnace.,
During the Cold War, the Sixth Directorate was responsible for monitoring Intelsat communication satellites traffic.
GRU Sixth Directorate officers reportedly visited North Korea following the capture (January 1968) of the USS Pueblo, inspecting the vessel and receiving some of the captured equipment.