After conducting Studies into past and more current events I can say most films are far from accurate. Take Vincent Maddog Coll for example. According to the film Mobsters in 91 Coll was killed by Luciano. In real life he was killed by Madden in a phone booth over a botched hit in which he shot a 5 year old kid. Why do film maker alter names?

But Art sets itself aside from History; it has no obligation to be multi-representative. If you want facts, read a textbook.