https://vault.fbi.gov/Mafia%20Monograph
It was written by the FBI in 1958 as a study of the origin, nature, and activities of the Mafia in its native Sicily and how it was transplanted to the United States. The first section of the monograph provides on overview of origins, nature, and activities of the Mafia in Sicily.
It can be converted into PDF
Mafia Monograph
Moderator: Capos