Operation Ajax — the 1953 Iranian coup
British and American intelligence services overthrew Iran's elected prime minister in August 1953, after he nationalised the country's oil. For sixty years the United States denied involvement. In 2013 the CIA released its internal history acknowledging the operation.
Why this verdict
Confirmed by the CIA's own internal history, declassified in 2013, and by the U.S. State Department's official documentary record published in 2017.
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01The claim
That the CIA and Britain's Secret Intelligence Service organised, funded and directed the removal of Prime Minister Mohammad Mosaddegh — paying crowds, planting newspaper propaganda, and coordinating with Iranian officers — in order to protect Western control of Iranian oil.
02Where it came from
In 1951 Iran's parliament voted to nationalise the Anglo-Iranian Oil Company, the British-owned concern that had extracted Iranian oil on terms Iran had no say in setting. Britain responded with a blockade and an embargo, then asked Washington for help removing Mosaddegh. The Truman administration declined. The Eisenhower administration, arriving in 1953 and persuaded to see the dispute through the lens of Soviet containment, agreed. Kermit Roosevelt Jr. of the CIA ran the operation from Tehran.
03What the record shows
✓ CONFIRMED — It happened. The documents exist.
The operation is documented from inside. The CIA's own classified history, 'The Battle for Iran', written by staff historian Donald Wilber in 1954, was released in redacted form in 2013 under FOIA and states plainly that the coup was carried out 'as an act of U.S. foreign policy, conceived and approved at the highest levels of government'. In 2017 the State Department published a retrospective volume of Foreign Relations of the United States devoted to Iran 1951–1954, replacing a notoriously sanitised 1989 edition that had omitted the covert action entirely.
The mechanics are equally documented: roughly $1 million authorised for the operation, payments to newspaper editors and to street organisers who staged both pro- and anti-Mosaddegh demonstrations, forged documents attributing plots to the communist Tudeh party, and coordination with General Fazlollah Zahedi, who became prime minister. The first attempt on 15 August failed and the Shah fled to Rome; the second, on 19 August, succeeded.
Historians continue to argue about weighting — how much the outcome depended on CIA money versus domestic Iranian actors, the clergy, and the army. That is a genuine scholarly dispute. Whether the operation happened is not one.
04What it cost
Mosaddegh spent the rest of his life under house arrest. The Shah ruled with expanded powers and a secret police force, SAVAK, trained in part by the CIA, until the 1979 revolution — whose rhetoric returned to 1953 constantly, and whose seizure of the US embassy was justified by its participants as pre-empting a repeat. Secretary of State Madeleine Albright acknowledged the coup's role in Iranian grievance in a 2000 speech. It is the clearest case in this archive of a covert action succeeding in the short term and setting the terms of a hostile relationship for seventy years.