As anthropologists, we strive to speak up for the often marginalized and underprivileged populations we study. Aiming to do so rigorously by heeding the structures that create and reproduce the injustices we witness, many of us have found our way to the critique of capitalism by Karl Marx and his followers. Moishe Postone introduced cohorts of anthropologists and others who were drawn to his cross-disciplinary courses at the University of Chicago to Marx and critical theory. While his writings have inspired scholars and activists worldwide and across the social sciences and humanities, Postone had also paved a path from Marxian theory to empirical critique that ethnographic fieldwork is well poised to accomplish.