Everybody knows this movie is mostly fictional, right? SPOILERS
This movie is more based off an old TV show by the same name than it is based on the actual events of Elliot Ness taking down Capone. Heck, I'm pretty sure Sean Connery's character is fictional. It is true that Elliot Ness had a friend who was killed by Capone but he was an ex con who I think was supplying info on Capone to Ness. Also Frank Nitti Was not thrown off a building by Elliot Ness. So there's another piece of fiction. I am not saying that I hate this movie but it is by no means a straight retelling of the events leading to Capone going to prison. I honestly think some people might not know this.
"You want me to roll 6,000 of these!? What? Should I quit my job!?"George Costanza, Seinfeld