das Stammlager in English: main or central camp; the administrative center of a complex of camps and/or places of forced labour (originally used of prisoner-of-war camps, later also – and now especially – of concentration camps), plural and article

Meanings

historicalmain or central camp; the administrative center of a complex of camps and/or places of forced labour (originally used of prisoner-of-war camps, later also – and now especially – of concentration camps)
In den Stammlagern wurden die Kriegsgefangenen registriert und auf die Betriebe verteilt.In the main camps, the prisoners of war were registered and distributed to the places of labour.