A rather good conspiracy movie. It was made in 1974 so it's a bit dated in parts (haircuts, cars, typewriters, TV sets, the video game 'Pong' etc) but these don't detract too much. It has all the essentials components that make a good conspiracy: a mysterious corporation is manipulating events, in this case The Parallax Corporation which carries out political assassinations. It has the brave, lone, investigative reporter (played by Warren Beatty) who finds out that witnesses to the killing of a US Senator in Seattle are being killed off one-by-one. He investigates, is recruited by Parallax, but finds out the hard way that such recruits are just patsies. I enjoyed it and rate it 4/5 stars. Aside: If you like a good conspiracy movie there's quite a good list on Wikipedia: search for "List of conspiracy-thriller films and television series".
Storyline been done so many times before and better and this was actually uninteresting, even though it must have been one of the first of that genre.