stabilityThis article is part of a multi-year study of governance structures in the midst of insecurity and organized crime in fragile sub-state regions where, in the absence of a strong state, non-state actors (like insurgents, traffickers and tribal warlords) engage in political and socioeconomic governance. Building on our prior work on West Africa and the Afghanistan-Pakistan tribal belt, this paper focuses on the Andean borderlands, drawing on recent fieldwork in Colombia, Ecuador and Venezuela. We explore patterns of behavior in which competition among violent non-state actors is not the norm. Instead, several instances were found in which violent non-state actors work collaboratively or have tacit non-interference agreements to provide public goods through arrangements we characterize as 'complementary governance. ' We therefore argue that, to understand how illicit authority emerges, it is not sufficient to consider one armed non-state actor in isolation or in a dichotomy to the state. As we contend, we have to take into account the complex connections and interactions among different (violent) non-state structures. Moving beyond state versus non-state governance to governance that is constitutive of various non-state groups, the perspective put forward in this article aims to enrich the current debate on governance and security.