History of the Soviet Union (1964–82) Soviet Union "would result in a crushing retaliatory blow". Though Brezhnev's time in office would later be characterized as one of stability, early on, Brezhnev oversaw the replacement of half of the regional leaders and Politburo members. This was a typical move for a Soviet leader trying to strengthen his power base. Examples of Politburo members who lost their membership during the Brezhnev Era are Gennady Voronov, Dmitry Polyansky, Alexander Shelepin, Petro Shelest and Podgorny. Polyansky and Voronov lost their membership in the Politburo because they were considered to be members of the "Kosygin faction." In their place came Andrei
Polish prisoners-of-war in the Soviet Union after 1939 Polish prisoners-of-war in the Soviet Union after 1939 As a result of the Soviet invasion of Poland in 1939, hundreds of thousands of Polish soldiers became prisoners of war in the Soviet Union. Many of them were executed; over 20,000 Polish military personnel and civilians perished in the Katyn massacre. On September 17, 1939, the Red Army invaded the territory of Poland from the east. The invasion took place while Poland was already sustaining serious defeats in the wake of the German attack on the country that started on September 1, 1939. The Soviets moved to safeguard their claims in