SCU was originally a break away faction of the Neapolitan Camorra. In the late 20th century they benefited from the Balkan Wars and had a profitable relationship with the Albanian Fares and the Grey Wolves. In the 2030s-2046, they were embroiled in a war with the Calabrian N'drangheta which almost destroyed them. They have a seat in the "Alta Commissoine".
The Sacra Corona Unita is an extremely hierarchical organization with 13 ranks and a council. It is the syndicate least prone to either infiltration or infighting due to its small size and complex initiatory rites.
Like the other major Italian syndicates it's involved in smuggling, protection rackets, and drug dealing. The syndicate is also involved in the trafficking of arms. SCU has had success expanding into Eastern Europe.
Sacra Corona Unita in the Real World
- Wikipedia: Sacra Corona Unita