During the industrial revolution artisans and craft workers sparked struggles against exploitation while the force of law drove unions underground. Today conditions are different yet they are not. Collective organizing is pre-empted not by legal prohibition but rather by a perverse internalized neoliberal logic that celebrates the precarious creative worker as its exemplar.Combination Acts draws together fifteen years of conversations with artists, musicians, activists, and theorists about the nature of collaborative practice. What sociality is produced by their practices? What forms of collectivity do they animate and embody? Taken together these dialogues provide a series of study notes for and from the self-organization of the undercommons, gesturing towards an aesthetics that occupies a space of power for itself by coming to close to, but never finally reaching, a set form.