What is the CIA?
The CIA is the largest intelligence agency in the United States.
Why can Harold and his faction use the CIA so willingly?
Because Harold and his allies are all people with wealth and power.
So is the CIA really willing to be driven by a bunch of nouveau riche?
Not at all.
Though everyone loves money, the CIA doesn't earn just any money, nor is it a tool for everyone to use.
The key lies in the fact that the CIA's duties originally include spying on foreign intelligence and interfering in the internal affairs of other countries, making it a handy tool for Old America to control certain nations.
Since Harold and his cohort are rich and influential, the CIA is of course willing to collaborate with them, as this facilitates control over Saudi and eases infiltration.
Thus, Harold's statement that they all like to use the CIA is actually incorrect; it's the CIA that's willing to let them use it. That's the real situation.