While immigration status is often arbitrarily ascribed, the moral meanings of undocumented status are central in the growing polarization and punitiveness of immigration politics in the United States. How do political actors construct the moral meanings of undocumented status and reason their preferred redresses? Existing substantialist approach’s search for a coherent list of moral traits is unable to locate the basis of such construction. Through interviews with a multiracial group of 65 Democratic and Republican activists, this paper identifies the relational meaning-making process underlying the construction of migrant morality, which I label as “Folk Durkheimian.” I find that, like Durkheim, activists believe that law exists to uphold social solidarities and therefore legal categories mark people as belonging or threatening to the social body. I further find that activists construct belonging and threat along two axes: similarity and division of labor. As both Democratic and Republican activists construct migrants as simultaneously belonging and threatening on different axes, both prefer the ambivalent redress of pathways to citizenship for a limited subset of migrants. This Folk Durkheimian understanding advances a relational and integrated framework for understanding morality, group politics, and punitive attitudes.