1941 (pre-war half-year period): changes in the NKVD structure of the Ukrainian Soviet Socialist Republic by V. A. Grechenko

“…The absolute attention of the historical scientific community is concentrated on the events associated with the beginning of the Soviet-German war. Therefore, a very small number of publications is focused on the pre-war half-year period of 1941. …”
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Police crime in 1947 in the coverage of the Ukrainian SSR state security agencies by O. N. Yarmysh, V. A. Grechenko

“…The involvement of police officers in various criminal and official crimes has been revealed: treason during the Soviet-German war, robbery, bribery, extortion, assistance to criminals, official negligence. …”
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