OKB-1 was the classified Soviet name of Sergei Korolev's design bureau in Kalinigrad, near Moscow, formed in 1950 from Department 3 of the Special Design Bureau of NII-88. It later evolved to become the Energia Rocket & Space Corporation (RSC Energia). Its rivals were Yangel's OKB-586 and, later, Chelomei's OKB-52.