it has overthrown elected democracies in iran ( mossadegh 1953 ) , guatemala ( arbenz 1953 ) , ecuador ( velasco 1960 ) , congo ( lumumba 1960 ) , brazil ( goulart 1964 ) , dominican republic ( bosch1963 ) , ghana ( nkrumah 1966 ) , chile ( allende 1973 ) , greece ( papandreou 1967 ) , bolivia ( paz 1964 ) venezuela ( chavez 2002 ) coup initially successful but failed .