I feel like the Chicago Outfit is a Neapolitan Origin Family/Street Gang and have a Horizontal Structure like the Camorra in Italy for instance all the Bosses up in the 1960/1970s became Sicilian Before that its was all Neapolitan Bosses and Underbosses and and there was No Induction Ceremony with Finger Pricking or Gun and Knife in the Table it was just a Big Lavish Banquet Dinner for New Made Guys and they use Ranks like Crew Boss for Captain and Leiutenant for Soldier and from what Frank Calabrese Jr says High Ranking Associate who run his own Neihborhood or Street Corner can be Considered a Boss don’t know if he’s the Best Source cause his brother Kurt says he lied about a lot of Stuff in his book and Last but not Least it seems the Outfit is a Family/Gang with Neapolitan/Sicilian mixed together from Structure and Rules