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In page Molotov–Ribbentrop Pact:
"Around that time, after several Gestapo–NKVD conferences, Soviet NKVD officers also conducted lengthy interrogations of 300,000 Polish POWs in camps[19][20][21][22] that were a selection process to determine who would be killed.[23] On 5 March 1940, in what would later be known as the Katyn massacre,[23][24][25] 22,000 members of the military as well as intellectuals were executed, labelled "nationalists and counterrevolutionaries" or kept at camps and prisons in western Ukraine and Belarus.[citation needed]
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