Henryk Ross was a photojournalist working for the Polish press when Germany invaded Poland and his hometown of Lodz in 1939. In the year that followed, Nazis violently rounded up Jews who didn't flee to neighboring European countries and forced them into the Lodz Ghetto — a one-square-mile section of the city, sealed off from the world by walls and barbed wire. Henryk Ross photographing for identification cards, Jewish Administration, Department of Statistics.