He began to organize the International Jewish Anti-Fascist Committee . During this time he established contacts with Stanisław Kot , the Polish ambassador in Moscow , and called for Polish Jews in the Soviet Union to join the Polish Anders Army . In October 1941 , Alter , together with Henrik Erlich were placed by the Soviet authorities in a hotel in Kuibishev ( Samar ) . During private conversations , which were taped and reported to Joseph Stalin , the two discussed the rumors about the murder of Polish officers , including many Polish Jews , at Katyn . On 4 December 1941 , he was again arrested by the NKVD , together with Erlich and murdered , although the precise details about his death are unknown . According to some reports , he was sentenced to death on 23 December 1941 , and immediately executed . Other sources state that his execution did not take place until February 1943 . The death sentence was signed by Vyacheslav Molotov in a note to Lavrentiy Beria , stating that Stalin had personally approved the order
Katyn
Katyn massacre
Victor Alter