Kazakhstan is characterized by ethnic, religious, and cultural diversity. However, the nation has not always had such a multiethnic composition. In the 1920s, Kazakhstan was a republic of the USSR and was mainly monoethnic. The Stalinist leadership aimed at eradicating social classes. To reach this goal, terror and intimidation were employed, targeting mostly members of the clergy, opposition leaders, intellectuals, artists, and former tsarist-government officials. Starting in 1934, political repression was particularly strong. Millions of Soviet citizens were exiled to the Urals, Siberia, and Kazakhstan. Opponents to the Bolsheviks from all over the USSR were held prisoner in concentration camps located in Kazakhstan.