Military intelligence
The first head of the Fourth Directorate was Yan Karlovich Berzin, who remained in the post from March 1924 until April 1935 (in 1938, he was arrested and executed as a Trotskyite during the Stalinist purges). Military intelligence was known for its fierce independence from the rival "internal intelligence organizations", such as the NKVD, and later KGB; however, public statements of Soviet military intelligence veterans state the Fourth Directorate, and later GRU, had always been operationally subordinate to the KGB. Military intelligence was headquartered in a small and nondescript complex west of the Kremlin, whereas the NKVD was in the very centre of Moscow, next to the building that housed People's Commissariat for Foreign Affairs at the bottom of Kuznetsky Most. Consequently, Soviet military intelligence came to be known in Soviet diplomats' cant as "distant neighbours" () as opposed to the "near neighbours" of the NKVD/KGB.