ABC’s Nightline‘s “Hidden America: Inside Chicago’s Gang War” explores Chicago’s new warzone with a segment on rapper Chief Keef.To date, there have been approximately 400 people killed in over a dozen neighborhoods in 2012 so far causing a 38% increase in homicides. President Obama even mentioned the growing gang problem in Chicago during one of the recent presidential debates. The Nightline segment gathered several gangs in a town hall meeting to discuss the problem in Chicago. Interscope records rapper Chief Keef makes a cameo during the segment.