Have You seen the movie Shindler's list? - part of it was recorded in the factory.

Oskar Shindler the private businessman made a Factory in Cracow and employed as many Jews as he could. Shindler knew how to make a bribe look like an act of friendship and therefore he won the loyalty of key officers in both the SS and the Wehrmacht. These friends in high places assured Schindler a steady flow of army contracts. This was the reason why the factory could have been operating. Ofcourse Jews made things that were the benefit of both the German war machine and the factory owner but this was the only way to survive. Oskar Shindler saved many lives by the fact that he gave work to Jews outside the Aushwitz Camp.