The mafia originated in Sicily, Italy in the early 19th century and is a criminal organization with a hierarchical structure. It is composed of groups of Sicilian descent that engage in criminal activities like drug trafficking and extortion. Famous American mafia leaders include Al Capone, who built a criminal empire in Chicago in the 1920s, and Lucky Luciano, considered the father of modern organized crime for establishing the Five Families of New York City. The mafia has been depicted in popular films like The Godfather that reflect their influence and criminal activities.