Poland suffered an exceedingly brutal Nazi occupation during the Second World War. Close to five million Polish citizens lost their lives as a result. More than half the casualties were Polish Jews. Thus, the second largest Jewish community in the world–only American Jewry numbered more than the three and a half million Polish Jews at the time–was wiped out. Over 90 percent of its members were killed in the Holocaust. And yet, despite this unprecedented calamity that affected both Jews and non-Jews, Jewish Holocaust survivors returning to their hometowns in Poland after the war experienced widespread hostility, including murder, at the hands of their neighbors. The bloodiest peacetime pogrom in twentieth-century Europe took place in the Polish town of Kielce one year after the war ended, on July 4, 1946.