So many inaccuracies
1. The movie depicted Elliot Ness as a humble family man who was devoted to his wife and kids when in reality he was divorced twice and married three times. He also never had a daughter and his son was adopted.
2. They also portrayed Ness as being staunchly against alcohol when in reality he was an alcoholic.
3. Frank Nitti was not killed by being thrown off a courthouse building. He committed suicide in 1943.
4. Nitti was portrayed as being evil and sinister when according to reports, he was described as a pleasant man who smiled a lot.
5. There were not 4 untouchables, there were actually 11 and none of them were killed by Capone's men.
6. The accountant guy was a real person named Frank Wilson but he was not one of the untouchables and his investigations into Capone's tax evasion case were separate of Ness' investigations of Capone's violations of the Volstead Act. He was also not murdered nor did he ever shoot a gun.
7. The Hotel lobby brawl never happened considering that Ness and Capone never met each other in person before the trial.
8. Capone did beat his henchmen to death with a baseball bat but there were three victims not one.
9. Capone's lawyer never withdrew his plea of not-guilty to guilty. Capone initially plead guilty to income tax evasion expecting two and a half year sentence from a deal struck up with the prosecutor. When the judge denied the deal, Capone plead not-guilty and went to court and was found guilty.
10. Jim Malone and George Stone were completely fictional. Most of the untouchables were wire tapping specialists and expert undercover agents. Not elderly beat cops within months of retirement nor fresh faced kids right out of the academy.