" This theory has been part of many people’s thinking about insurgency and civil war for a long time. But the cases we’ve examined in this chapter suggest that it applies to any nonstate armed group that preys on a population. It applies to insurgents, terrorists, drug cartels, street gangs, organized crime syndicates, pirates, and warlords, and it provides useful explanations and insights for law enforcement, civil war, and diffuse social conflict—not just for insurgency. I will suggest that we treat this theory (until another theory emerges that better fits the available facts) as a working model for dealing with future threats. "

― David Kilcullen , Out of the Mountains: The Coming Age of the Urban Guerrilla