 Although most of the facts in the film are mostly close to the  truth, the only real deviation comes in the fate of Joe Aiello.  While the movie does accurately portray Aiello aligning himself with  Moran and conspiring to kill Mafia chieftain "Patsy" Lolardo, he was  not killed personally by Al Capone on a train (Though Capone was  known to personally kill when seized by a fit of personal rage). As  shown in the film, Aiello, knowing he was marked for death by  Capone, did arrange to have a cousin purchase a train ticket for him  at the last minute so that he could skip town. However, he was  killed by machine gunners from an apartment window opposite his  apartment building as he was leaving to catch the train on October  23rd, 1930: A year and nine months after the massacre, not before.