martial arts groups in Timor-Leste have a nationwide reach and have offered a resource of physical and social engagement for youth and adults for several decades. Yet, their involvement in crime, politics, and violent clashes, and their notorious reputation as troublemakers posing a threat to security and peace, have caused the government to permanently ban three major groups. Based on intensive fieldwork and qualitative interviews with members and leaders of illegalized groups, this analysis explains why the young democracy’s decision is not contributing to building peace. The three main findings from the interviews are that root causes of violence are not addressed by the ban, criminalization draws more people into illegality, and the positive aspects of these groups, which could potentially contribute to peace, are neglected.