Charles Barber, writer-in-residence in letters, is the author of a new book that tells the dramatic story of William Juneboy Outlaw III. Formerly the head of a major cocaine gang in New Haven, Outlaw turned his life around and now is an award-winning community advocate, leading a team of former felons who negotiate truces between gangs on the very streets that he once terrorized. Barber wrote Citizen Outlaw: One Man's Journey from Gangleader to Peacekeeper, published Oct. 15 by HarperCollins, in collaboration with Outlaw. The two gave a WESeminar and book signing on Nov. 1 at Russell House as part…