Has the U.S. Government ever used terror?

Well, the New York Times has documented that Iranians working for the C.I.A. in the 1950's posed as Communists and staged bombings in Iran in order to turn the country against its democratically-elected president (see also this essay).

And, as confirmed by a former Italian Prime Minister, an Italian judge, and the former head of Italian counterintelligence, NATO, with the help of the Pentagon and CIA, carried out terror bombings in Italy and blamed the communists, in order to rally people's support for their governments in Europe in their fight against communism.As one participant in this formerly-secret program stated: "You had to attack civilians, people, women, children, innocent people, unknown people far removed from any political game. The reason was quite simple. They were supposed to force these people, the Italian public, to turn to the state to ask for greater security."