Comité antifasciste juif
During the Second World War, he lost one son in combat, and actively participated in meetings held by the Jewish Anti-Fascist Committee, which was set up to represent the Soviet Jewish voice in the war effort. In a 1944 meeting, he declared the war to be a "holy war" to "free the sons of Israel." For that year's Passover, he stood alongside the leading Soviet Jewish scientists, writers, and fighters to note the great effort Soviet Jews were making to ensure victory.