In 1921, the Democratic Republic of Georgia was occupied by the Soviet Bolshevik forces from Russia, and until 1936 Tbilisi functioned first as the capital city of the Transcaucasian SFSR (which included Armenia, Azerbaijan, and Georgia), and afterward until 1991 as the capital of the Georgian Soviet Socialist Republic. During Soviet rule, Tbilisi's population grew significantly, the city became more industrialized, and it also came to be an important political, social, and cultural centre of the Soviet Union. In 1980 the city housed the first state-sanctioned rock festival in the USSR. As a major tourist destination for both Soviet citizens and foreign visitors, Tbilisi's "Old Town" (the neighborhoods within the original city walls) was reconstructed in the 1970s and 1980s.