Although teachers used to teach in the communities where they resided, they now commute to schools in other districts. For teachers who teach in districts that are culturally or ethnically different than their own, it may be a new experience of which to become aware or identify issues such as dealing with gang behavior. For other teachers, there is a clear perception that those who teach in more affluent schools need not be concerned with gangs, while those who teach in unstable neighborhoods and areas of high drug use and violence do need to be concerned about gangs (Johnson 2005). In this article, the author explains what constitutes a gang and discusses several key indicators of involvement--clothing, tattoos, changes in a student's behavior and school performance--to help teachers identify students who have ties with gang. Educators need to identify at-risk students as early as possible; unfortunately, in low-income neighborhoods with high gang activity, all children are at risk.