Files of prisoners (Polish Jews) convicted of communist activities; most of them perished during the Holocaust. Files are from the following prisons located in: Kielce, Krasnystaw, Lwów, Piotrków Trybunalski, Płock, Radom, Sanok, Sandomierz, Sieradz, Tarnów, Warszawa-Mokotów, Zamość, Sosnowiec, Koronowo, Wronki, Kalisz, Gniezno, Bydgoszcz-Fordon, Częstochowa.