Step inside the violent world of 12 of America’s most brutal gangs in the fourth season of this gritty History Channel series. The show lets viewers in on the dynamics within the gangs while also providing insight from law enforcement experts. Episodes cover the Avenues from Los Angeles, the East Coast Pagans, Chicago's Latin Kings, the Best Friends from Detroit, Tennessee's LMG (Love Murdering Gangsters), Colorado's Sons of Silence and more.