How do 100 major criminal justice groups in the United States work to affect public policies dealing with criminal justice in all its aspects? Institutional analyses are arranged alphabetically, describing the groups in terms of their history, purpose, principal activities and concerns in relation to Congress, and key resource materials. Appendices list the organizations with their addresses and regular publications. The authors summarize their work statistically and provide the survey questionnaire the groups all received. A brief bibliography points to a few significant sources on criminal justice groups as a whole. Internal cross-references and a full index make the reference easily accessible to students, teachers, and professionals.