During the first Five-Year Plans of the 1930s, Chelyabinsk experienced rapid industrial growth. Several important factories, including the Chelyabinsk Tractor Plant and the Chelyabinsk Metallurgical Plant, were built at this time. During World War II, Joseph Stalin decided to move a large part of Soviet manufacturing to areas removed from the reach of the advancing German military as part of a general exodus from western occupied areas. This brought new industries and thousands of workers to Chelyabinsk, including facilities for the production of T-34 tanks and Katyusha rocket launchers. During World War II, the city's industries produced 18,000 tanks and 48,500 tank diesel engines as well as over 17 million units of ammunition. During that time Chelyabinsk was informally called “Tankograd” (English: “Tank City”). During World War II, the S.M. Kirov Factory no. 185 or “OKMO” was moved to Chelyabinsk from Leningrad to produce heavy tanks, although it was transferred to Omsk after 1962.