Slavs
Slavs are the largest ethno-linguistic group in Europe. Present-day Slavic people are classified into East Slavs (chiefly Belarusians, Russians, Rusyns, and Ukrainians), West Slavs (chiefly Czechs, Kashubs, Moravians, Poles, Silesians, Slovaks and Sorbs), and South Slavs (chiefly Bosniaks, Bulgarians, Croats, Macedonians, Gorani, Pomaks, Montenegrins, Serbs and Slovenes).
Sloboda Ukraine
After the establishment of the Soviet Union Sloboda Ukraine was divided between the Ukrainian SSR and the Russian SFSR. The early 1930s forced end to Ukrainization in the parts of Sloboda Ukraine located in the Russian SFSR led to a massive decline of reported Ukrainians in these regions in the 1937 Soviet Census compared to the 1926 First All-Union Census of the Soviet Union. The Ukrainian SSR reorganized their part of the region several times before establishing the borders of present-day Kharkiv Oblast in 1932.