Amurlag
Russia
Amur Railroad Corrective Labor Camp (Amurlag) was a subdivision of GULAG which existed during 1938-1941. It was created from the disbanded Bamlag. Its administration was headquartered in the settlement of Svobodny, Amur Oblast. Its main activity was railroad construction. Its peak headcount was about 125,000 (1938). In 1941 it was disestablished and its subcamps were resubordinated to ru: and ru:.
Prison data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).