Not sure what you mean by "prominant" but without any question, in my book, Lucky Luciano would undeniably be one of the most prominant mafia bosses, as he organized the commission and the modern-day structure of the mafia, he ws from sicily and even helped organize the end of WWII as he got the cooperation from sicily to invade and stop the germans, so he was, on all levels, someone who ruled internationally one way or the other. When I was in Sicily I asked if they knew who Gotti was, they all looked at me and nodded no, gotti was much hype from the NY Press, he was flamboyant, but that is also what lead to his demise by the FBI. Colorful, powerful, yes, but he pales in comparison to most others like Capone, Gambino, Columbo, etc etc.