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In page History of Belarus:

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The Polish part of Belarus was subject to Polonization policies (especially in the 1930s), while the Soviet Belarus was one of the original republics which formed the USSR. For several years, the national culture and language enjoyed a significant boost of revival in the Soviet Belarus[citation needed]. A Polish Autonomous District was also formed. This was however soon ended during the Great Purge, when almost all prominent Belarusian national intelligentsia were executed, many of them buried in Kurapaty. Thousands were deported to Asia. As the result of Polish operation of the NKVD tens of thousands people of many nationalities were killed. Belarusian orthography was Russified in 1933 and use of Belarusian language was discouraged as exhibiting anti-soviet attitude.[1]