He said "Carmine Cuneo" in the film. As SC said, it was "Ottilio Cuneo" in the novel, and he "controlled upper New York State" and "arranged smuggling of Italian immigrants from Canada" etc. That description fits Stefano Magaddino, the long-time Don of Buffalo, NY, to a "T." But Magaddino was not one of the real-life five New York City Dons, which keeps this ball rolling. Assuming that the meeting was held between, say, 1947 and 1951, the five New York City Dons would have been: Frank Costello, Tommy Lucchese, Joe Bonanno, Joe Profaci and Vincent Mangano (replaced by Albert Anastasia after 1952). If the fictional meeting had been a genuine "Commission" meeting, it would certainly have included Magaddino (who was a permanent member of the Commission and later chaired it); and several non-NY Dons, though they might not have been from the cities Puzo cited because out-of-town memberships rotated.