After World War II, AIOC and the Iranian government initially resisted nationalist pressure to revise AIOC's concession terms still further in Iran's favour. But in March 1951, the pro-western Prime Minister Ali Razmara was assassinated.[18] The Majlis of Iran (parliament) elected a nationalist, Mohammed Mossadeq, as prime minister. In April, the Majlis nationalised the oil industry by unanimous vote.[19] The National Iranian Oil Company was formed as a result, displacing the AIOC.[20] The AIOC withdrew its management from Iran, and organised an effective boycott of Iranian oil. The British government – which owned the AIOC – contested the nationalisation at the International Court of Justice at The Hague, but its complaint was dismissed.[21]
By spring of 1953, incoming U.S. President Dwight D. Eisenhower authorised the Central Intelligence Agency (CIA) to organise a coup against the Mossadeq government with support from the British government.[22] On 19 August 1953, Mossadeq was forced from office by the CIA conspiracy, involving the Shah and the Iranian military, and known by its codename, Operation Ajax.[22]
Mossadeq was replaced by pro-Western general Fazlollah Zahedi[23] and the Shah, who returned to Iran after having left the country briefly to await the outcome of the coup. The Shah abolished the democratic Constitution and assumed autocratic