The Abadan Crisis was a major event in Iranian history. It began in 1951 with the nationalization of the Anglo-Iranian Oil Company by the government of Iran, and the shutting down by the British of the Anglo-Iranian Oil Company's huge oil refinery in Abadan. It ended with a successful CIA-orchestrated coup which overthrew the democratically elected government of Mohammed Mosaddeq in 1953, and enabled the Shah to rule autocratically for the next 26 years, before he was overthrown by the Iranian Revolution.