During the Second World War Flick's industrial enterprises used 48,000 forced labourers from Germany's concentration camps. It is estimated that 80 per cent of these workers died as a result of the way they were treated during the war. Flick was found guilty of war crimes at Nuremberg in 1947 and was sentenced to seven years in prison, but was pardoned 3 years after and resumed control over his industrial conglomerate, becoming the richest person in West Germany.