SMERSH was an umbrella organization for three independent counter-intelligence agencies in the Red Army formed in late 1942 or even earlier, but officially announced only on 14 April 1943. The name SMERSH was coined by Joseph Stalin. The formal justification for its creation was to subvert the attempts by Nazi German forces to infiltrate the Red Army on the Eastern Front.
SMERSH
SMERSh identity document
The People's Commissariat for Internal Affairs, abbreviated NKVD, was the interior ministry of the Soviet Union.
Early NKVD leaders, Genrikh Yagoda, then (1924) 1st deputy head of SOU OGPU Vyacheslav Menzhinsky then head of SOU OGPU and deputy head OGPU, and Felix Dzerzhinsky chief of OGPU, 1924
NKVD chief Genrikh Yagoda (middle) inspecting construction of what was then called the Moskva-Volga Canal, 1935. Behind him is Nikita Khrushchev
Lavrentiy Beria with Stalin (in background) and Stalin's daughter Svetlana