'''Note''': NKVD (Soviet Union) executed tens of thousands of Polish political prisoners in 1939-1941/ [http://en.wikipedia.org/wiki/Katyń_massacre Katyn massacre '''''link''''']. | '''Note''': NKVD (Soviet Union) executed tens of thousands of Polish political prisoners in 1939-1941/ [http://en.wikipedia.org/wiki/Katyń_massacre Katyn massacre '''''link''''']. |