hunting license

Hi there,
I'm trying here to give you enough context to help me understand exactly what is the "hunting license" here, is it a metaphor? if yes, what does it mean in this context?

"The President: What can we do? We can get Griswold, Lemitzer, Friendly, Reagan, Jack Connor, Shannon, Dillon.

Kissenger: You might think of Rusk. This will get very rough and you need people around who know the Presidency, and the national interest.
What Colby has done is a disgrace.

The President: Shoud we suspend him?

Kissinger: No, but after the investigation is over you could move him and put in someone of towering integrity.

When the FBI has a hunting license into the CIA, this could end up worse for the country than Watergate."


thanks