 (His concentration camp number is 243).His decent knowledge of the German language allowed him to work, among other jobs at various times, at a mill (grain) warehouse in Babice (future subcamp of Auschwitz, ) as a clerk, where he had occasional access to additional food and came in contact with the Polish anti-Nazi resistance, the Home Army.Assigned to an "Arbeitskommando" at Auschwitz, Bielecki met Cyla Cybulska at a grain warehouse, serving with the women repairing burlap sacks.