The Parallax View is a 1974 American political thriller film produced and directed by Alan J. Pakula, and starring Warren Beatty, Hume Cronyn, William Daniels and Paula Prentiss. The screenplay by David Giler and Lorenzo Semple Jr. was based on the 1970 novel[1] by Loren Singer. The story concerns a reporter's investigation into a secretive organization, the Parallax Corporation, whose primary focus is political assassination.

https://en.wikipedia.org/wiki/The_Parallax_View