Inmate social organization was once a central area within criminology that stalled just as incarceration rates dramatically climbed. In this review, we return to seminal works on this topic before summarizing the changes that mass incarceration wrought in correctional contexts and the potential impacts of these changes for inmate society. We then review the few recent studies that document contemporary inmate social life and call for increased researcher-practitioner partnerships that embed criminologists within carceral settings. We suggest that network approaches are particularly useful for building on past qualitative and ethnographic insights to provide replicable results that are also easily conveyed to correctional authorities. As the era of mass incarceration peaks, we argue that the time is ripe for renewed interest in inmate society and its connections to prison stability, rehabilitation, and community reintegration.