It's kind of the same situation with Corsica.
The Corsican criminal groups have been the main French OC for several decades (the so called "French connection" was actually the "Corsican Connection") and they are by far the most clanic and organized group of all the French groups but they don't have the rules and codes of the Mafia (induction ceremony, official hierarchy, families,...). They still are very powerful.though and it's probably the same with Sardinian groups.
Corsican groups can actually be considered to be a certain force in OC though.
Can't say the same for whatever small pockets of Sardinian criminals there may be, who are definitely not noteworthy enough to be considered a force in OC.
