Book excerpt: Revised 2021 - The History of the Mexican Mafia, updated and improved, tracks the evolution of La EME from its beginnings in California Prisons, to taking over the streets, and spreading to Federal Prisons. It is filled with hundreds of pictures as well as historical documents. It also shows ways we might prevent prison violence and recruitment into these gangs.The book has a 11 pt. font which is readable by most people who don't need glasses, but is available in larger font for those who wish it.