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In September 1939, the armies of Germany and the Soviet Union invaded Poland. The aggression was a consequence of the Ribbentrop-Molotov Pact concluded on August 23. Polish prisoners of war were sent, among others, to Soviet camps. In the spring of 1940, over the course of two months, NKVD units killed nearly 22,000 officers, policemen, scientists, clergy, lawyers, doctors, teachers and social activists. They were buried in mass graves in present-day Russia, Belarus and Ukraine. We are sharing another episode of the film series "Expertise", produced by the TVP Historia channel in cooperation with #IPN and the Institute of Forensic Research in Krakow. The documentary entitled "Expertise. Katyn Death Pits" was produced in 2019.