Director and co-writer Martin Scorsese knows his way around a mob picture, and in this sprawling story that takes place over more than a decade, we see Chicago sport handicapper Sam “Ace” Rothstein (Robert De Niro) given his big break when the mafia sends him to Las Vegas to take charge of the Tangiers Casino. He soon doubles the casino’s profitability, skimming the extra cash to deliver to his mob bosses…