Flashy, intricate, and unflinchingly violent account of mob-run ’70s Vegas clicks when exploring the inner workings of a major casino and its hierarchy. Final part of the Scorsese underworld crime trilogy that began with “Mean Streets” and continued in “GoodFellas.” Casino boss Sam “Ace” Rothstein (De Niro), his ex-hustler wife Ginger (Stone), and his loose-cannon enforcer pal Nicky (Pesci) are the principals in this lengthy, fictionalized account of how the mob lost Las Vegas in a haze of drugs, sex, coincidence, and betrayal.