In this bold film, intrepid director Matthew Heineman moves between two modern-day vigilante movements on either side of the U.S.-Mexico border. They share a common threat, murderous Mexican drug cartels, from whom their governments have failed to keep them safe. Heineman achieves astounding access, witnessing events from within, and powerfully captures the motivations and actions at the core of each movement. On the front lines of harrowing violence and dramatic turns of events, CARTEL LAND navigates thorny, unclear territory. Are these actions inspired and necessary? Or driven by more complex desires?