Special Council of the NKVD

Within the administration of the Soviet Union, the Special Council of the USSR NKVD (Russian: Особое совещание при НКВД СССР (ОСО), romanized: Osoboe soveshchanie pri NKVD SSSR, (OSO)) was created by the same decree of Sovnarkom of July 10, 1934 that introduced the NKVD itself. The decree endowed the Special Council with the right to apply punishments "by administrative means", i.e., without trial.

Source: Wikipedia — Special Council of the NKVD (CC BY-SA 4.0)