A study commissioned by Continental showed that the German auto supplier played a big role in the Nazi regime's war economy, using about 10,000 slave laborers to make and test gas masks, military tires and other products.
According to the research by historian Paul Erker, the company employed concentration camp inmates, some of whom died. Erker, who has written a book about his findings, said the laborers were forced to work underground and live in inhumane conditions during the later years of World War II.