Gabriel Morales is a Gang Specialist with extensive experience working with juvenile and adult offenders for over 30 years. He has taught Gang I.D. and Management to thousands of criminal justice workers. He was the Founder and a past Advisor for the Int'l Latino Gang Investigators Association. He also wrote "Varrio Warfare: Violence in the Latino Community", "La Familia: Prison Gangs in America", and many other books. He also has an autobiography entitled "The Life & Times of a Vato Loco". Joe Sparks was a Chicago PD Officer for 33 years, most of that time being spent in the gang unit. Over his career he dealt with a multitude of criminal figures and gang leaders. He testified in multiple gang cases and shares stories in this book that have never been told before. Sparks not only talks about all of the major Folks & People gangs, he describes Organized Crime, Outlaw Bikers, Drug Cartels, and other lessor known Chicago gangs.