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Background The Programme de suivi intensif de Montréal – Gangs de rue (PSI-MTL/GDR) [Montreal Intensive Supervision Program – Street Gangs] was implemented in Montreal from 2009 to 2014 with 138 male offenders and 4 female offenders  aged 15 to 25 who were involved in criminal street gang activity and at a high risk of recidivism, or who were at risk of experiencing crimes associated with street gangs. The program, which was inspired by the Community-Wide Approach to Gang Prevention, Intervention, and Suppression (Spergel et al., 1994), was intended to progressively align treatment principles between different partners and circulate information among stakeholders 24 hours a day, 7 days a week. Treatment areas for the program included monitoring, supervision, assistance, and referrals for young people. An evaluation measured the impact of the PSI-MTL/GDR on offending behaviours and criminogenic risks, social integration, and the level of youth engagement in street gangs. A descriptive analysis of program costs was also carried out.