Has Showtime stumbled upon the next Sopranos? The network is developing an hourlong drama series about the Mafia's first family that will explore the history of organized crime in America. The untitled series hails from Goodfellas scribe Nicholas Pileggi, Boardwalk Empire creator Terence Winter and power producer Brian Grazer, whose Imagine Television Studios will produce alongside Showtime. All three men will serve as executive producers, as will Imagine TV's Samie Kim Falvey. Deadline broke the news, reporting that the show is "inspired by Pileggi's in-depth chronology of organized crime in America -- which is also the history …