On March 5, 1940, a note to Joseph Stalin from Beria saw the members of the Soviet Politburo — Stalin, Vyacheslav Molotov, Lazar Kaganovich, Mikhail Kalinin, Kliment Voroshilov, Anastas Mikoyan and Beria — signed an order for the execution of "nationalists and counter-revolutionaries" kept at camps and prisons in western Ukraine and Belarus. This execution became known as the Katyn massacre, where 22,000 perished
