The Main Directorate of State Security (Russian: Glavnoe Upravlenie Gosudarstvennoi Bezopasnosti, Главное управление государственной безопасности, ГУГБ, GUGB) was the name of the Soviet intelligence service, secret police from July 1934 to April 1943. It was run under the auspices of the Peoples Commissariat of Internal Affairs (NKVD). Its first head was first deputy of People's Commissar of Internal Affairs (then - Genrikh Yagoda), Commissar 1st rank of State Security Yakov Agranov.