We now know that the Commission had (at least officially) banned drug dealing and that anyone caught would be whacked. The Godfather seems to do the opposite where the Commission would permit the sale of drugs, but that it would be controlled. Was the real Commission's policy on drugs known in the movie and novel were made? The drugs were still a good catalyst for the plot though so I'm not necessarily complaining that they made a goof by not following the real-life policy.