The causes of violence and aggression vary considerably. Some violence is linked to gang activity; hate-motivated behaviors that target specific types of students such as ethnic, racial, and religious groups, or gay, lesbian, bisexual, and transgender students; and drugs including fights over turf and the violent behavior of some students who are using drugs. In addition, some school conditions, often called school-based risk factors, contribute to violence and aggression. These include factors such as poor design of school space, overcrowding, insensitivity of educators toward multicultural factors, student alienation, rejection of at-risk stusents by teahers and peers,anger and resentment at school routines, demands for conformity, the physical condition of the school, and the lack of support from administrators.