Crimes & persecution
Katyn massacre
3 Apr 1940 – 19 May 1940 · Katyn Forest, Kalinin, Kharkiv and other sites
In April–May 1940 the Soviet NKVD executed about 22,000 Polish prisoners of war and detainees — officers, police, officials and members of the intelligentsia — on the basis of a Politburo decision of 5 March 1940. The USSR denied responsibility until 1990.
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- [1]Katyn massacre
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