You would like the film The Conversation (1974).
For a second I thought this was the Mel Gibson movie where he proves a Conspiracy Theory (1997)... but Gene Hackman, post-Watergate — with an ensemble cast of eavesdroppers?! — tonight's movie, decided.
Thank you for your recommendation - it be crazy up in here (head, country, world).
Enemy of the State is a pretty good light weight successor of that movie as well. It's such a fun watch too. (RIP Gene Hackman)