As some of the posters said, during its peak, which was between the mid 1950's and early 60's, the Outfit had rather small membership compared to the Genvoese or Gambino crime families in NY. But back in the period between the mid 1930's and 40's, I believe that the organization had quite large membership because by that time many new members were welcomed into the criminal brotherhood and on top of that many old members were still alive.