I found a  movie review on New York Times, which talks about Oliver Stone’s Talk Radio. In this review, the author refers that the whole movie was inspired by a real-life story, which happened in 1984. He indicates,

“In addition, they’ve grafted onto the play elements from the real-life story of Alan Berg, the Denver talk-show host who was murdered in 1984 by a white supremacist group – the same event used by Costa-Gavras as the starting point for his recent film, ”Betrayed.””

And he also says,

“”Talk Radio,” opening today at the Beekman, is a nearly perfect example of how not to make a movie of a play. Mr. Stone has fancied it up not only with empty narrative asides but also with idiotic camerawork, exemplified by his use, toward the end, of the Lazy Susan shot. “