In the 1930s the sphere of prosecutors' supervision activity in spite of its formal developing (a prosecutor started to monitor the disciplinary practice inside prisons and law compliance by prison staff, to secure the prisoners' particular rights) was actually narrowed because of the further widening of alternative political sentence system consisting of ITLs (Correctional Labour Colonies) supervised by NKVD (Peoples' Commissariat of Internal Affairs). Severing of the Soviet punitive policy led to the abolition of the previously existing public forms of custody monitoring. Actually, all of them stopped functioning in traditional ways as independent public agents and were transformed to administrative organs. Prosecutors' supervision was preserved as the only form of public custody monitoring in the system of common justice. The mentioned trends developed till the 1950s. The main factors providing the prosecutions' custody supervision in this period were the USSR Prosecutors' Office Formation and Centralization, common prisons and ITLs concentration in NKVD system, and the criminal policy change. The imminent process of prosecutors' custody supervision activity in the 1930s was not finished. The main reason was the appeared deficiency in law, which regulated the sphere and methods of prosecutors' supervision. The Constitution of the USSR of 1936 and other legislation, which regulated the prosecution activity of new Soviet Prosecutors' Offices, did not settle any legal basis for prosecutors' custody monitoring. At the same time the penal, criminal and prosecution legislation of the Soviet Russian Federation lost its validity because of the USSR formation. Thus, a permanent penitentiary reorganization, prosecutors' supervision reforming, legal regulation of custody monitoring by subordinate legislation, a wide application of department rule-making and the USSR Prosecutors' Office formation provided the collapse of real prosecutors' supervision till the end of the 1950s.
