Read Gangs in Garden City by Sarah Garland. In gives a history of how MS-13 formed, and details how the Reagan administration let them in to save them form communism in their country, only to have them turn into our nightmare in America. MS-13 is just a part of the book, but the details and research are great.
https://www.amazon.com/Gangs-Garden-City-Immigration-Segregation/dp/1568586159

Last edited by jace; 06/11/18 10:44 PM.