From the Introduction: The overall goal of the research project was to understand the gang phenomenon in the United States. In order to accomplish this goal, I thought it necessary to understand what was similar in the way all gangs behaved and what was idiosyncratic to certain gangs. In addition, I thought it was also necessary to understand why certain gangs grew, others declined but lingered on, and others declined and died. What follows is an explanation of the research design, the method of data gathering, the method of data analysis and presentation, and some ethical issues related to the research. Past research on gangs had for the most part focused on gangs in one section of a city, gangs in one city, or gangs of one ethnic group. In order to understand the nature of the gang as an organization and the gang phenomenon in general, I believed it was necessary to undertake a comparative study. This was the only way to understand what gangs have in common with each other and what is idiosyncratic to particular gangs.