Chicago gangs are effective if you need to kill someone at point blank range at a gas station or spray bullets in a neighborhood where you miss everything but a 6 year old coloring in their room.
American gangs have ruled areas with soft targets and no real opposition. The Venezuelans have more of a ruthless mentality. They're not killing people so they sit around and smoke. They're war minded first. The collateral damage will be so much greater than it has been, and for Chicago that is saying something.