Recent estimates predict that there are currently more than 16,000 active gangs in the United States, and gang members number close to 1 million individuals and are responsible for over 600,000 crimes per year. Discussing research on gangs and gang-related criminal behaviors, the author details both a Colorado-Florida and a Cleveland research study focused on self-reported data concerning gang-related criminal activities. The data generated by these research studies indicate significant differences between the behavior of gang members and at-risk youths, although both groups indicated involvement with guns and gang members. Gang members are often more involved in selling drugs than are at-risk youths, and gang leaders typically engage in the more serious forms of criminal behavior such as the drug trade. This research preview suggests that earlier studies have identified a close relationship between gang membership and various forms of criminal behavior.