"if it were not possible to effectively imprison the majority of people in the world in impoverished enclaves, there would be no incentive for Nike or The Gap to move production there to begin with. Given a free movement of people, the whole neoliberal project would collapse."
https://newleftreview.org/II/13/david-graeber-the-new-anarchists
Great David Graeber article from 2002.