People in groups act aggressively as a group, not as a collection of individuals. The Psychology of Group Aggression's comprehensive journey starts with group dynamics theory and research by reviewing its relationship to aggression. Arnold P. Goldstein then provides a unique and valuable insight into the different types and levels of intensity of anti-social behavior, examines its causes and considers its costs. In separate chapters he considers low intensity aggression, including ostracism, hazing, teasing, mid-intensity, e.g. bullying and harassment, and high intensity aggression, e.g. mobs and gangs. In a final section, he considers management and intervention techniques, both widely employed and emerging methods. "The Psychology of Group Aggression" is an important work for both a pure and an applied audience. It will be a key reference for many, including clinical and forensic psychologists, psychiatrists, criminal justice workers, social psychologists and academics and students in criminology, psychology and sociology.