Transnational coordination and communication have become increasingly important themes in scholarship on social movements. The alterglobalization movement is one of the most globally networked movements in recent history. As part of its repertoire, every year thousands of people travel from around the world to protest the G8, the gathering of the world's eight most powerful leaders. When the G8 came to Japan in 2008, local activists decided to organize a mobilization similar to those previously held in Western Europe and North America. The shift from Europe to Japan, however, proved more difficult than anticipated. I explore three factors that together hindered the mobilization: trust, miscommunication, and state repression. Through an analysis of action planning meetings, I explore how interpersonal trust combined with dynamics of individual and collective risk to shape relations of inclusion, exclusion, and hierarchy. I describe the interplay among trust, miscommunication, and repression to show how interpersonal trust undermined the movement's own goal of prefiguring more horizontal political structures and, paradoxically, expanded the impact of state repression by creating an individuation of responsibility that implicated movement actors themselves in narrowing the forms of protest available.