Glavnoje Razvedyvatel'noje, known by the is the acronym GRU, is the foreign military intelligence directorate of the General Staff of the Armed Forces of the Russian Federation, (formerly the Red Army General Staff of the Soviet Union).
The GRU is Russia's largest foreign intelligence agency. It deploys six times as many agents in foreign countries as the SVR, the agency that succeeded the KGB. It also commanded 25,000 spetsnaz troops in 1997.
One of the GRU's duties during World War III was to root out potential traitors in the Soviet armed forces.
When Leonid Tsederbaum, a crewman of the Soviet airplane that atom-bombedParis, committed suicide, GRU agent "Ivan Ivanov" interrogated Tsederbaum's mates for signs of disloyalty which might have indicated the reason for his decision to die.
The GRU was the intelligence wing of the SovietRed Army. Following Lavrenty Beria's 1963 botched attempt to overthrow General Secretary Vyacheslav Molotov and the subsequent rise in Marshal Georgy Zhukov's prestige, the GRU took on many of the duties of the heavily purged NKVD, an organization it had always seen as something of a rival.