Jewish Military Union
1920–1943) was a Polish Army officer and a Jewish youth leader in Warsaw and one of the senior commanders of the Jewish Military Union, or the ŻZW. Although one of the most important leaders of the Warsaw Ghetto Uprising and the Jewish resistance in the months preceding April 1943, Frenkiel is also one of the least well known to historians, and both his earlier life and his ultimate fate are a subject of some controversy.