Martin Scorsese collaborated with Nicholas Pileggi on this 1990 adaptation of Wiseguy, Pileggi’s nonfiction book about gangsters in Brooklyn, and in terms of narrative fluidity it may well be the most accomplished thing Scorsese’s ever done. Set between the mid-50s and the mid-80s, the semifictionalized story centers on a half-Irish, half-Sicilian Mafia recruit (Ray Liotta)who narrates along with the Jewish woman (Lorraine Bracco) he eventually marriesand the other gangsters in his immediate circle (Joe Pesci, Robert De Niro, and Paul Sorvino). Paradoxically, the violent, amoral world the film depicts may be the darkest Scorsese has ever shown, but the surface mood is lighter than any Scorsese film since Alice Doesn’t Live Here Anymore. Stylistically, it’s a remarkable effort, but the sociological insights never go very far beyond the obvious. R, 146 min. (JR)