Presents assessment strategies, preventive methods, and clinical interventions to assist clinicians working with teenagers involved with deviant subcultures: Satanism, the neo-Nazi skinhead movement, and violent street gangs. Considers role of alienation as contributing factor in adolescents' participation in these subcultures. Advises therapists to be knowledgeable about adolescents' involvement, empathic to their circumstances, and sophisticated in approach to treatment. (Author/NB)