The labor of witnessing, however, is heavy with contradictions that in some contexts may deepen, rather than ameliorate, the racial, gendered, and social wrongs we seek to redress. This is the central dilemma undergirding the three articles in this collection, which critically interrogate the involvement of anthropologists as expert witnesses in four legal proceedings involving Indigenous and Afro-descendant land claims in Mexico, Nicaragua, Honduras, and Chile. While the cases direct our attention to collective claims to autonomy and self-determination in Latin America, they also shed light on broader disciplinary debates concerning the role of anthropologists within the legal realm as well as how ethnographic knowledge intervenes in the production of social facts within post-truth regimes (Ho and Cavanaugh 2019).The global trend toward extreme right-wing politics, alongside the expansion of extractivist economies and unprecedented levels of environmental destruction, has forced anthropologists to rehearse, yet again, how to bring our expertise to bear on issues of urgent public concern. 1 In her 2014 annual review essay, Courtney Morris framed the debate surrounding the practice of engaged anthropology as a matter of life and death: "What would happen if we imagined our work as a practice of freedom, an act of imagination, a tool for transforming an unequal world? What if we did the work of anthropology as though our lives and the lives of others depended on it?" (Morris 2015). What Morris suggests is the necessity to question, critique, and strengthen the role of anthropology in the promotion of social change, at best, or at least to hold at bay further death and destruction, as what progressively seems to be the calling of our times. Firmly anchored in an anthropology for liberation long promoted by Black, Latinx, and Native scholars (Allen and Jobson 2016;Ranco 2006), public anthropology in the