Rage

An accidental nerve gas leak by the military kills not only a rancher's livestock, but also his son. When he tries to hold the military accountable for their actions, he runs up against a wall of silence.

Rage is a 1973 drama mystery movie directed by George C. Scott, starring Richard Basehart, Martin Sheen, Barnard Hughes. It holds an IMDb rating of 6.3/10 from 1,526 votes and runs 1h 40m.