It may have been "mad" as in angry or "mad" as in deranged. Either way, almost 40 years ago, screenwriter Paddy Chayefsky anticipated the future of television news. He envisioned a nasty, profit-oriented industry that would literally kill for ratings. (Network was — after all — satire, not a documentary.) Dave Itzkoff's account of how the brilliant, stubborn and pugnacious Chafesky did his research, wrote his script and, ultimately, imposed his vision on the film is elegantly executed.