The study will draw exclusively from community groups that participate in law-enforcement-related activities and from only those community-building efforts that aim explicitly to reduce the fear and disorder that breed crime. The study will identify the conditions that spawn and sustain community anti-drug efforts. It will determine what change agents or catalysts play critical roles in the initiation of community anti-drug efforts and ascertain what factors nurture and sustain neighborhood anti-drug groups. One case study will describe the formation of a community group catalyzed by a police department, and another case will describe how a single individual mobilized a neighborhood. A third case will examine how an ongoing neighborhood group shifted its orientation from recreation and community development toward drug trafficking. A fourth case will examine the role of professional community organizers in stimulating and coordinating the anti-drug efforts of neighborhood residents. To examine the maintenance of community efforts to thwart drugs, three case studies will focus on the activities of groups that have been operating for a minimum of 2 years with a high level of citizen participation. 11 notes and an outline of case program protocol