He's teaching the students at Brandel High two words... NO MORE.

The Principal (1987)

Directed by Christopher Cain

Burglary. Drugs. Assault. Rape. The students at Brandel High are more than new Principal Rick Latimer bargained for. Gangs fight to control the school using knives - even guns - when they have to. When Latimer and the head of security try to clean up the school and stop the narcotics trade, they run up against a teenage mafia. A violent confrontation on the campus leads to a deadly showdown with the drug dealer's gang, and one last chance for Latimer to save his career... and his life.