There’s a very good essay on the career and impact of Edward R. Murrow by Nicholas Lemann in The New Yorker. An excerpt:
Clooney’s film takes great pains to be accurate about all the specifics. It isn’t just the way people dressed and carried themselves; every word Strathairn says on the air, Murrow said on the air. Those Murrow shortcomings (by today’s lights) that pertain to the McCarthy story, such as his having voluntarily signed the CBS loyalty oath, are duly inserted somewhere or other in the screenplay. Still, without ever misstating anything, “Good Night, and Good Luck” leaves you with the impression that Murrow was an early, and the dispositive, attacker of McCarthy, and that isn’t exactly the case. Murrow was genuinely courageous, and not just in this instance, but the real story is more complicated.