The Russian Soviet Federative Socialist Republic (RSFSR) was the largest and most influential constituent of the former Soviet Union. Established in 1917 after the October Revolution, it served as the foundation for the creation of the USSR in 1922. The RSFSR was characterized by its commitment to Marxist-Leninist ideology and aimed to create a classless society through state control of the economy and resources. The RSFSR encompassed a vast territory, including major cities like Moscow and St. Petersburg. It played a crucial role in the development of Soviet policies and governance. The republic existed until the dissolution of the Soviet Union in 1991, after which it became the independent Russian Federation.