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:

As originally established, the Registration Department was not directly subordinate to the General Staff (at the time called the Red Army Field Staff – Polevoi Shtab). Administratively, it was the Third Department of the Field Staff's Operations Directorate. In July 1920, the RU was made the second of four main departments in the Operations Directorate. Until 1921, it was usually called the Registrupr (Registration Department). That year, following the Soviet–Polish War, it was elevated in status to become the Second (Intelligence) Directorate of the Red Army Staff, and was thereafter known as the Razvedupr. This probably resulted from its new primary peacetime responsibilities as the main source of foreign intelligence for the Soviet leadership. As part of a major re-organization of the Red Army, sometime in 1925 or 1926 the RU (then Razvedyvatelnoe Upravlenye) became the Fourth (Intelligence) Directorate of the Red Army Staff, and was thereafter also known simply as the "Fourth Department." Throughout most of the interwar period, the men and women who worked for Red Army Intelligence called it either the Fourth Department, the Intelligence Service, the Razvedupr, or the RU. […] As a result of the re-organization [in 1926], carried out in part to break up Trotsky's hold on the army, the Fourth Department seems to have been placed directly under the control of the State Defense Council (Gosudarstvennaia komissiia oborony, or GKO), the successor of the RVSR. Thereafter its analysis and reports went directly to the GKO and the Politburo, apparently even bypassing the Red Army Staff.

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.