The Katyn massacre, carried out by the Soviet NKVD in 1940, was only one of many unspeakable crimes committed by Stalin's ruthless executioners over three decades. The mass murder of thousands of Polish officers was part of a relentless purge, the secrets and details of which have only recently been partially revealed.
Vyacheslav Mikhailovich Molotov ((OS 25 February) 9 March 1890 – 8 November 1986) was a Russian politician and diplomat, an Old Bolshevik, and a leading figure in the Soviet government from the 1920s onward. He served as Chairman of the Council of People's Commissars from 1930 to 1941 and as Minister of Foreign Affairs from 1939 to 1949 and from 1953 to 1956. Description above from the Wikipedia article Vyacheslav Molotov, licensed under CC-BY-SA, full list of contributors on Wikipedia.