国家政治保卫局
EPRON was established on 17 December 1923 and was initially under the Joint State Political Directorate () at the Council of People's Commissars. Its first operation was treasure-hunting near Sevastopol for the wreckage of HMS Prince, a steamship sunk by a storm off Balaklava in November 1854 when it was carrying gold from Britain to pay British troops fighting in the Crimea (GBP 200,000).