This study proposes an analytical framework to study the network of street gangs in Montreal, including some affiliated to the two major American coalitions : Crips (blue) and Bloods (red). The objectives are two-fold : a) Describe the nature of the gangs themselves, emphasizing some of their core organizational features ; b) Describe the relational dynamics within the network, once the gangs are allowed to interact (positively or negatively) with each other. We also want to understand in which ways the dynamics are orchestrated along the traditional perspective, that is, rivalries only occur between opposite consortiums. These objectives are fulfilled through an analysis of focus group interviews involving 20 youth gang members currently doing time in Centre jeunesse de Montreal-Institut universitaire. These youth gang members were affiliated to a diversity of gangs and coalitions. Together, they identified a total of 35 active gangs in Montreal. The resulting structure includes models of relationships expected by the traditional view, conflicts inter-coalitions (77 % of all negative relations n = 43) and allies intra-coalition (87 % of all positive relations n = 40). Exceptions to the rule have been raised in our study and lead to a more nuanced understanding of Montreal’s street gang network.