WUSA is a 1970 American drama film, directed by Stuart Rosenberg. It was written by Robert Stone, based on his novel A Hall of Mirrors. The story involves a radio station in New Orleans with the eponymous call sign which is apparently involved in a right-wing conspiracy. It culminates with a riot and stampede at a patriotic pep-rally when an assassin on a catwalk opens fire.
The cast included Paul Newman, Joanne Woodward, Anthony Perkins, Laurence Harvey, Cloris Leachman and Wayne Rogers. Paul Newman called it "the most significant film I've ever made and the best."
(Summary from Wikipedia)