I think we have to cut Puzo and FFC some slack here:
They acknowledged the Commission with the Don's conference after Sonny was killed. They made it seem like an ad hoc meeting to specifically set a framework for a nationwide drugs policy. In real life, the Commission met every five years after Charlie Luciano went to prison. But, five years or no, the Commission was not consulted about Albert Anastasia's assassination of Vincent Mangano, or Vito Genovese's assassination of Anastasia.