re: #183 Nyet
People from the Kozelsk camp were executed in Katyn Forest; people from the Starobelsk camp were killed in the inner NKVD prison of Kharkiv and the bodies were buried near the village of Piatykhatky; and police officers from the Ostashkov camp were killed in the internal NKVD prison of Kalinin (Tver) and buried in Mednoye. All three burial sites had already been secret cemeteries of the victims of the Great Purge of 1937-1938. Later, recreational areas of NKVD/KGB were established there.
Nice to know they found some use for the burial sites afterwards.