 Complete the following phrase:  The MGB was just one of many incarnations of the Soviet State Security apparatus. After the revolution, the Bolsheviks relied on a strong political police or security force to support and control their regime. During the Russian Civil War, the Cheka were in power, relinquishing it to State Political Directorate GPU in 1922 after the fighting was over. The GPU was then renamed The Peoples Commissariat for Internal Affairs NKVD in 1934. From the mid-1930s and until the creation of the KGB, this Organ of State Security was re-organized and renamed multiple times depending on the needs and fears of the leadership. In 1941, the state-security function was separated from the NKVD and became the Peoples Commissariat for State Security NKGB, only to be reintegrated a few months later during the 