A "Mafia" type organization, or more appropriately, a "mafioso" mentality, is extremely common to Southern Italians born back in their homeland. Whether or not they choose to go into the criminal life, per se. It is a mentality, unique to Italy/Sicily, instilled in them since they were children by their parents and blood family.

Even American-born Italian street guys who were raised 'correctly' by their elders can exhibit a 'mafioso' styled mentality that carries them through life. Whether they choose to be legitimate businessmen or take to the streets to make a living.

Because, truth be told, a 'true' mafioso is born, not made!
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Here's the second half of my answer. lol. (I forgot to write it).

That said, if a bunch of fellas got together. And they had the sufficient amount of balls and brains and moxie, they could create a Mafia-styled crew, as good, if not better, than a so-called formally recognized LCN "Family." (especially nowadays in 2023 where all these crews as screwed up and are running on fumes.)