Mayor of Warsaw Hanna Gronkiewicz-Waltz solemnly unveils a plaque honoring Pawel Frenkel, a leader of the 1943 Warsaw Ghetto Uprising, in Warsaw, Poland, on Tuesday March 20, 2012. Frenkel was a senior commander of the Jewish Military Union, an underground resistance group that opposed the Nazi occupation of Poland during World War II. He died in the uprising. (AP Photo/Czarek Sokolowski)