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Mafia is a blanket term used to describe 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 and fraud. 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" or "the Japanese 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.
There are several theories about the origin of the term "Mafia" (sometimes spelled "Maffia" in early texts). The Sicilian adjective mafiusu (in Italian: mafioso) may derive from the slang Arabic mahyas (مهياص), meaning "aggressive boasting, bragging", or marfud (مرفوض) meaning "rejected". In reference to a man, mafiusu in 19th century Sicily was ambiguous, signifying a bully, arrogant but also fearless, enterprising, and proud, according to scholar Diego Gambetta. In reference to a woman, however, the feminine-form adjective "mafiusa" means beautiful and attractive.
Other possible origins from Arabic:
The public's association of the word with the criminal secret society was perhaps inspired by the 1863 play "I mafiusi di la Vicaria" ("The Mafiosi of the Vicaria") by Giuseppe Rizzotto and Gaetano Mosca. The words Mafia and mafiusi are never mentioned in the play; they were probably put in the title to add a local flair. The play is about a 
A formal definition of "mafia" can be hard to come by. The term was never officially used by Sicilian mafiosi, who prefer to refer to their organization as "Cosa Nostra". Nevertheless, it is typically by comparison to the Sicilian Mafia that other criminal groups earn the label. The expansion of the term has not been welcomed by all scholars. Giovanni Falcone, an anti-Mafia judge murdered by the Sicilian Mafia in 1992, objected to the conflation of the term "Mafia" with organized crime in general:
While there was a time when people were reluctant to pronounce the word "Mafia" ... nowadays people have gone so far in the opposite direction that it has become an overused term ... I am no longer willing to accept the habit of speaking of the Mafia in descriptive and all-inclusive terms that make it possible to stack up phenomena that are indeed related to the field of organized crime but that have little or nothing in common with the Mafia.—Giovanni Falcone, 1990
Scholars such as Diego Gambetta and Leopoldo Franchetti have characterized the Sicilian Mafia as a "cartel of private protection firms", whose primary business is protection racketeering: they use their fearsome reputation for violence to deter people from swindling, robbing, or competing with those who pay them for protection. For many businessmen in Sicily, they provide an essential service when they cannot rely on the police and judiciary to enforce their contracts and protect their properties from thieves (this is often because they are engaged in black market deals). Scholars have observed that many other societies around the world have criminal organizations of their own that provide essentially the same protection service through similar methods.
For instance, in Russia after the collapse of Communism, the state security system had all but collapsed, forcing businessmen to hire criminal gangs to enforce their contracts and protect their properties from thieves. These gangs are popularly called "the Russian Mafia" by foreigners, but they prefer to go by the term "krysha".
With the [Russian] state in collapse and the security forces overwhelmed and unable to police contract law, cooperating with the criminal culture was the only option [...] most businessmen had to find themselves a reliable krysha under the leadership of an effective vor.
In Italy, the term associazione di tipo mafioso ("Mafia-type organisation") is used to clearly distinguish the uniquely Sicilian Mafia from other criminal organisations that are structured like the Sicilian Mafia, such as the Camorra, the 'Ndrangheta, the Sacra Corona Unita. Article 416-bis of the Italian Penal Code, under which all criminal organisations are prosecuted, defines an association as being of Mafia-type nature "when those belonging to the association exploit the potential for intimidation which their membership gives them, and the compliance and omertà which membership entails and which lead to the committing of crimes, the direct or indirect assumption of management or control of financial activities, concessions, permissions, enterprises and public services for the purpose of deriving profit or wrongful advantages for themselves or others."
Mafia-proper can refer to either:
Other Italian criminal organizations include: