From NetFlix:

Amid the savage Irish and Italian rivalry that dominated New York City in the mid-1800s, Amsterdam Vallon (Leonardo DiCaprio) hunts down his father’s hateful murderer, Bill “the Butcher” Cutting (Daniel Day-Lewis). Along the way, Vallon falls for the charms of a streetwise pickpocket (Cameron Diaz). Director Martin Scorsese’s riveting epic — nominated for 10 Oscars — also stars Jim Broadbent, Liam Neeson, John C. Reilly and Henry Thomas.

Before seeing this film, at least read the Wikipedia article which at the very end gives historical references. According to this Wikipedia article, the New York scenes were very accurate. But the history itself is a different matter. Many liberties were taken with the facts. Still the underlying theme of the persecution of the Irish is quite valid. Moreover there were historical figures such as Bill Cutting (who was a butcher), but the film is at odds with their real history.

Violence is the chief characteristic of this film, and gory violence at that. Daniel Day-Lewis plays his usual blood-thirsty villain. For my money this was a black and white melodrama whose main attraction was indeed the many slaughters. And for some reason I have never been able to convince myself that Cameron Diaz can act.

Netfilx sends the film as two discs.