“ The CIA started this in 1953.”
Mossadegh ignored Iran’s constitution, the parliament, and the shah in an attempt to set himself up as a dictator. He dissolved the parliament, fired a bunch of generals, and set up un-secret elections that heavily favored his own party. Just about everyone in Iran didn’t like this guy. The CIA claimed the success, but, in fact, had little to do with getting rid of this guy.
A lot like Salvador Allende in Chile.