Gangs in Schools: Responding to Gangs in Schools: A Collaborative Approach to School Safety [open pdf - 7MB]
From the Impact to Schools: "Gang affiliation is not something that students leave behind when they come to school. Gang members do not leave their behaviors, attitudes, and conflicts outside the school environment. Gangs, unchecked and unidentified in a school setting, often engage in threat and intimidation; physical and cyber bullying; fighting; recruiting; and criminal activities such as the introduction and use of weapons, assault, sex trafficking, vandalism, and illegal drug sales. The absence of a well-developed, strategic, collaborative, and effective school safety plan can lead to violence and other unsafe and disruptive activities within a school setting."
National Gang Center: http://www.nationalgangcenter.gov/