“A spectacular exhibition of contemporary art opened in Berlin yesterday, amid a picket by Jewish protesters, with its billionaire owner accused of exploiting art to redeem his family’s Nazi past.” The quality of the works in the collection is not in question, but the motivations of their owner, Christian Friedrich Flick, are being picked over by press and public alike. The Flick family fortune, which made the art collection possible, was built on slave labor in the explosives factories of the Third Reich.