Source of acquisition is the Instytut Pamięci Narodowej-Komisja Ścigania Zbrodni przeciwko Narodowi Polskiemu (Institute of National Remembrance-Commission for the Prosecution of Crimes against the Polish Nation). After Polish military units captured the records in 1945, the Ministry of Security (after 1956, Ministry of the Interior) held them as a closed collection until 1985. Polish security agencies did not keep accurate records relating to these files. Some items intended to assist security activities were subsequently added from Soviet and other repositories. Source of acquisition is the Institute of National Memory, Main Commission for the Investigation of Crimes Against the Polish Nation, which now holds the collection as Sygn. 362. The Main Commission for the Investigation of Crimes Against the Polish Nation - Institute of National Memory filmed the records for the United States Holocaust Memorial Museum Archives in 1991.