Of the Jewish ghettos established in Poland by the Nazis during W.W. II, the Warsaw Ghetto was the largest. Up to 460,000 Polish Jews lived there before they were deported to concentration camps. They did not go without a fight. In April 1943, Jewish resistance groups led an uprising even though they knew victory was nearly impossible. Other than photographic documentation taken by German forces, there was no visual proof of the uprising. Recently, however, secret photos of the 1943 rebellion in Warsaw have come to light. They were taken by the Polish firefighter Zbigniew Leszek Grzywaczewski. “The sight of those people taken out of there will probably remain in my eyes for the rest of my life,” Grzywaczewski wrote in his diary. A new film traces the two families who preserved the images. —Maggie Turner