[Vinnie]

I thought the CIA’s charter, or whatever, was external. No domestic spying.

[SetFree]

I think Presidential Decision Directive PDD-62 (May 22, 1998) helped get CIA foot more in the door stateside including some of the basis for “Fusion Centers” and JTTF:

https://www.youtube.com/watch?v=aY94prtutXw

https://fas.org/irp/offdocs/pdd/

https://fas.org/irp/offdocs/pdd-62.htm