<p>Developing theories, evidence, and methods that could help to reduce crime is foundational to crime research. Here we present an interdisciplinary framework that can shed light on old theories and open up promising avenues for novel research into diverse criminogenic areas including violence, desistance, turning points, individual and family risk factors, and reintegration. This framework relates to ‘identity fusion’– a powerful form of group bonding whereby the individual’s personal and social selves become ‘fused’. We argue that the fusion mechanism is an underappreciated cause of– and simultaneously a potential solution to– many forms of criminal behaviour. Accordingly, we discuss applied opportunities to develop this approach from both theoretical and policy perspectives.</p>