Table of Contents -- List of Tables -- List of Figures -- Acknowledgments -- Introduction -- Review of the Literature -- Research Method -- The Quality of Korean Community Life -- Assimilation: Comparison of General Characteristics of Delinquent Groups and Youth Gangs -- The Delinquent Group: Joong and His Boys -- The Gang: Mo Ming Pai -- Conclusion -- Notification Form -- Social and Physical observation Instrument -- Questions Used at Informal Interview -- Formal Questionnaire -- Profile of the Delinquent -- Group Members -- Profile of the Mo Ming Pai Gang members -- Reference -- Index.