How about the FBI informant in the US for 17 years is the guy who 'entraps' Mark Caputo with. Phone call to TT and then gets passed along to Roger Stone who tells them to pound sand? First 10 mins of this podcast. Stone tells the 'informant' to BTFO.
https://ricochet.com/podcast/byron-york-show/hey-was-that-russian-with-the-fbi/