Chełmno extermination camp
After the war, some Chełmno extermination camp personnel were tried in Poland as well as in other court cases spanning a period of about 20 years. The first judicial trial of three former members of the "SS-Sonderkommando Kulmhof", including camp's deputy commandant "Oberscharführer" Walter Piller, took place in 1945 at the District Court in Łódź. The examination of evidence during the investigation was carried out by Judge Władysław Bednarz. The subsequent four trials, held in Bonn, began in 1962 and concluded three years later in 1965 in Cologne.