The last person charged in connection with the crimes at Chełmno was a Pole, Henryk Mania. He was one of eight Polish prisoners who worked with the camp "Sonderkommando". Mania had been originally imprisoned after being accused of attempting to poison a German. These eight prisoners has previously worked at a sonderkommando at Fort VII prison where they would dispose of dead prisoners. The men were then transferred to Chełmno after being selected by Herbert Lange Fifty-six years after the end of World War II, he was convicted as an accessory to murder.