By the spring of 1953, incoming US President Dwight D. Eisenhower authorised the Central Intelligence Agency (CIA), to organise a coup against the Mossadeq government, the 1953 Iranian coup d'état. In August 1953, the coup brought pro-Western general Fazlollah Zahedi to power as the new PM, along with the return to Iran of the Shah Mohammad Reza Pahlavi from his brief exile in Italy. The anti-Mossadeq plan was orchestrated by the CIA under the code-name 'Operation Ajax', and by the British SIS (MI6) as 'Operation Boot'.