The city underwent many major changes. As a result, Baku played a great role in many branches of Soviet life. Baku was the major oil city of the Soviet Union. From about 1921 the city was headed by the Baku City Executive Committee, commonly known in Russian as ''Bakgorispolkom''. Together with Baku Party Committee (known as the ''Baksovet''), it developed the economic significance of the Caspian metropolis. From 1922 to 1930 Baku became the venue for one of the major trade fairs of the Soviet Union, serving as a commercial bridgehead to Iran and the Middle East.