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In page History of Belarus:

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More than 200,000 ethnic Poles left or were expelled to Poland in late 1940s and late 1950s, some killed by the NKVD or deported to Siberia.[citation needed] [2] Armia Krajowa and post-AK resistance was the strongest in the Grodno, Vawkavysk, Lida and Shchuchyn regions.[3]