 Sites included Bronna Góra, Ponary and others.Irrespective of round-ups for extermination camps, the Nazis abducted millions of foreigners for slave labour in other types of camps, which provided perfect cover for the extermination programme.Prisoners represented about a quarter of the total workforce of the Reich, with mortality rates exceeding 75 percent due to starvation, disease, exhaustion, executions, and physical brutality.