As agreed by the Allies at the Yalta conference Germans were used as forced labor as part of the reparations to be extracted to the countries ruined by Nazi aggression. By 1947 it is estimated that 4,000,000 Germans (both civilians and POWs) were being used as forced labor by the U.S., France, the UK and the Soviet Union. German prisoners were for example forced to clear minefields in France and the low countries.