“CIA is not permitted to operate inside the US.”
And, when they do operate inside the US they use credentials of a different agency. Occasionally, when they bump into that agency, it kicks up a ruckus. When a company I worked for had a program for the CIA they identified themselves as Defense Intelligence agents.
This began when J. Edgar Hoover refused to cooperate with the CIA and share intelligence.
Ways around that. The movie “Sicario” is an example of one.
He was a weird guy with ego and ethics problems, but he was astute enough to spot some of the problems in the CIA (and by extension, the old OSS).
Mr. niteowl77