Omertà (/ɵˈmɛrtə/; Italian pronunciation: [omerˈta]) is a popular cultural attitude and code of honour that places heavy importance on a deep-rooted "code of silence", non-cooperation with authorities, and non-interference in the illegal (and legal) actions of others. It originated and remains very common in areas of Southern Italy, such as Sicily, Apulia, Calabria, and Campania, where Mafia-type criminal organizations such as the Cosa Nostra, 'Ndrangheta, Sacra Corona Unita, and Camorra are strong. It also exists to a lesser extent in certain Italian-American neighbourhoods where the Italian-American Mafia has influence and other Italian ethnic enclaves in countries where there is the presence of Italian organized crime (i.e. Germany, Canada, Australia).
Omertà implies "the categorical prohibition of cooperation with state authorities or reliance on its services, even when one has been victim of a crime." A person should absolutely avoid interfering in the business of others and should not inform the authorities of a crime under any circumstances (though if justified he may personally avenge a physical attack on himself or on his family through the use of vendetta). Even if somebody is convicted of a crime he has not committed, he is supposed to serve the sentence without giving the police any information about the real criminal, even if that criminal has nothing to do with the Mafia himself. Within Mafia culture, breaking omertà is punishable by death.