Mafia

Ma·fi·a (mä'fē-ə) n.
A secret criminal organization operating mainly in the United States and Italy and engaged in illegal activities such as gambling, drug-dealing, protection, and prostitution.

Any of various similar criminal organizations, especially when dominated by members of the same nationality.

A secret criminal organization operating mainly in Sicily since the early 19th century and known for its intimidation of and retribution against law enforcement officials and witnesses.