Following its establishment in 1934, the NKVD underwent many organizational changes; between 1938 and 1939 alone, the NKVD's structure and leadership changed three times.
Dende a súa crwación en 1934, o NKVD da URSS experimentou moitos cambios organizativos; só entre 1938 e 1939, a estrutura do NKVD cambiou tres veces.