Organised criminal groups remain a current issue in Germany. In contrast, there is a lack of scientific research. This book chapter presents the Berlin study on juvenile offenders with links to organised crime (OC), especially to “clan crime”. The aim of the study was to investigate the responsiveness to social therapy in prison and recidivism of this group in juvenile detention. The OC affiliation was captured by an expert assessment on a four-level scale (no to clear indications). Juveniles with links to OC started offending earlier and more frequently. They showed significantly more misconduct during detention, leading to more therapy dropouts. Regarding recidivism after release, the picture was less clear. OC affiliation was only significantly associated with severe violent recidivism within 5 years. Even though the results suggest a limited therapeutic response and a particular challenge in dealing with this clientele, it seems premature to derive a general contraindication for social therapy from this. Further research is needed to enable a calm discussion about involved individuals.