This special issue focuses on illegal practices and the forms of value produced as people engage in them. Embracing a methodological orientation that attends to criminalized networks and the values they structure from the inside, the contributions included here highlight micro processes of exchange and evaluation. By linking the study of local worlds to the apprehension of wider structural and cultural dynamics and processes, the collection develops a critical perspective on formal law s legitimizing and delegitimizing effects with respect to the ethical and economic values illegal activities produce.