Jewish Military Union
Following the outbreak of World War II, German conquest of Poland and the start of German repressions against the Jewish population of Poland, he joined the Jewish Military Union and became one of its highest-ranking members. It is unclear what his exact capacity was. Earlier publications and accounts by Tadeusz Bednarczyk, Henryk Iwański and Kałmen Mendelson assert, that Paweł Frenkel was one of the deputies of JMU's commander Dawid Moryc Apfelbaum. However, other accounts, including those by Dawid Wdowiński and Cezary Szemley suggest, that Frenkiel was indeed the leader of the entire organisation. In recent years some historians went as far as to suggest that Apfelbaum did not even exist at all.