Main Intelligence Directorate, abbreviated 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.

Yan (Ian) Karlovich Berzin, was a Latvian Soviet communist politician and military intelligence officer.