During the 1920s, Kyrgyzstan saw considerable cultural, educational, and social change. Economic and social development also was notable. Literacy increased, and a standard literary language was introduced. The Kyrgyz language belongs to the Kipchak Turkic group of languages. In 1924, an Arabic-based Kyrgyz alphabet was introduced, which was replaced by Latin script in 1928. In 1941 Cyrillic script was adopted. Many aspects of the Kyrgyz national culture were retained despite suppression of nationalist activity under Joseph Stalin, who controlled the Soviet Union from the late 1920s until 1953.