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Sport-related violence is widespread. Yet, there is a poor understanding of what factors trigger hooligans to become unruly. In this paper I test the so called frustration-aggression hypothesis, which holds that thwarted expectations from a reference point tend to lead to violent behavior. I use unique data on hooligan violence in Sweden. I find that frustration, generated by a team's bad performance, indeed leads to unruly supporter behavior. A one-position drop in the soccer league leads to approximately 5 percent more unruly behavior by the team's supporters. The analysis helps policy makers in their endeavors to reduce group-related violence. [ABSTRACT FROM AUTHOR]