An honest cop. Who would believe that? Serpico is directed by Sidney Lumet and adapted to screenplay by Waldo Salt and Norman Wexler from Peter Maas’ biography of NYPD officer Frank Serpico who stood up to expose rife corruption in the force. It stars Al Pacino, John Randolph, Jack Kehoe, Biff McGuire, Bernard Barrow, Nathan George and Tony Roberts. Music is by Mikis Theodorakis and Giacomo Puccini and cinematography by Arthur J. Ornitz.. Great story telling meets a first class acting performance in Lumet’s searing movie. Frank Serpico (Pacino), a legend to us mere mortals out on the street,…