Have newcomers to American cities been responsible for a disproportionate amount of violent crime? Dangerous Strangers takes up this question by examining the incidence of criminal violence among several waves of immigrant/ethnic groups in San Francisco over 150 years. By looking at a variety of groups - Irish, German, Italian, and Chinese immigrants, primarily - and their different experiences at varying times in the city's history, this study addresses the issue of how much violence can be attributed to new groups' treatment by the host society and how much can be traced to traits found in their community of origin. Dangerous Strangers fills an acknowledged gap in the literature of homicide studies and broadens our understanding of newcomer violence.

Kevin J. Mullen is retired deputy chief of the San Francisco Police Department. He is the author of Let Justice Be Done: Crime and Politics in Early San Francisco.