The american mafia could survive only just having as a reference the Ndrangheta, which is almost impenetrable and which supplanted in power the Sicilian Mafia.
The boys of the Ndrangheta grow and are introduced through marriages between young people who are already introduced, creating some blood ties, because no one would betray, this would impact on his family, exposing it to transversal vengeances, in Calabria Ndrangheta kids grow already knowing what is their fate, they are already indoctrinated as children.
In addition, the division into local and untouchable hierarchy that undergoes continuous changes with degrees that are discovered by the police more often, making the Ndrangheta a mixture of a criminal organization and a Masonic lodge.