Chicago is struggling to contain gang violence fueled by heroin and other drugs  — 80 percent of it from the Sinaloa cartel that Joaquin Guzman runs from the remote mountains of northern Mexico. The 5-foot-6-inch Guzman, a grade school dropout known as El Chapo (or Shorty), in 2006 declared his intent to make Chicago his “home port”. Since then, he has seized control of the supply and wholesale distribution of narcotics in Chicago and much of the Midwest, Bloomberg Markets reports in its October 2013 issue. The drugs are sparking often deadly turf wars between Chicago’s splintered, largely African-American gangs while fueling a heroin epidemic in some of the city’s more-affluent suburbs.