Jewish Military Union
In the summer of 1942, during the occupation of Poland, Wdowiński founded, along with many Jews from the Polish Army and Polish Jewish political leaders, the clandestine Jewish Military Union (ŻZW) in the Warsaw Ghetto. Some of the members of this group included Dawid Apfelbaum, Józef Celmajster, Henryk Lifszyc, Kałmen Mendelson, Paweł Frenkiel and Leon Rodl. Wdowiński was never a military commander, serving instead as political head of the ŻZW.