Oddly enough, All The Presidents Men was just part of a trilogy of conspiracy films, the Parallax View took on the notion of a dark agency/corporation setting up patsies for political assassinations and even has a waiter/killer similar to Sirhan’s shooting of Bobby K.
The Parallax View - Trailer
https://www.youtube.com/watch?v=KSMfrfpj9FQ
https://en.wikipedia.org/wiki/Alan_J._Pakula
Pakula was also notable for directing his “paranoia trilogy”: Klute (1971), The Parallax View (1974) and All the President’s Men (1976).
Thanks for telling me. I wrote down the names of a couple of these movies and I am going to watch them on On Demand.