Mafia "is a type of organized crime syndicate that primarily practices protection racketeering — the use of violent intimidation to manipulate local economic activity, especially illicit trade; secondary activities may be practiced such as drug-trafficking, Loan sharking andfraud. Being bonded together by a code of honour, in particular the code of silence (or omertà in southern Italy), safeguards the Mafia from outside intrusion and law enforcement action.
The term was originally applied to the Sicilian Mafia, but has since expanded to encompass other organizations of similar methods and purpose, e.g. "the Russian Mafia", "the Japanese Mafia", or "the Albanian Mafia". The term is applied informally by the press and public; the criminal organizations themselves have their own terms (e.g. the Sicilian and American Mafia calls itself "Cosa Nostra", the Mexican Mafia calls itself La Eme and the "Japanese Mafia" calls itself yakuza). When used alone, "Mafia" typically refers to either the Sicilian Mafia or the American Mafia."
The American Mafia "(or simply the Mafia or Mob in the United States)
is an Italian-American criminal society."