The CIA almost committed terrorism against the US in order to blame Cuba for it!

It was called Operation Northwoods. The acts of terrorism were to include high-jackings and bombings. The targets were going to be places like Miami and Washington. The idea was that CIA operatives would commit the fake terrorist acts, then they would plant false evidence and blame it on Cuba.

Cuba had recently become a communist nation, but the government needed public support to make the dealings with them more aggressive than they were up to that point. The plan was drafted by the Joint Chiefs of Staff, the highest levels of military advisors to the President. Fortunately, John F. Kennedy declined to accept the plan and it was never put in motion.

(Source)