The case study will examine the development and implementation of an anti-violence coalition formed in response to youth violence episodes in Washington Heights, NY. Neighborhood violence and drug dealing has caused residents to limit their activity and daily walking trips outside their homes. This study will assess activity in the neighborhood before and after the outbreak of violence and will describe the efforts made by local leaders to control this violence. Interviews will be conducted with area youth, local leaders, elected officials, and other adults who live and work in the area. The case study will contribute to our understanding of the ways in which citizen mobilization can make public spaces safe for essential and recreational physical activity.