Class of 1984
Prophetic (if in ideology rather than substance) of Columbine et al, and really cool for boys too young to see it, as I was.
A music teacher starts work at a dive inner city school where a gang of students are criminal mercenaries and the teachers are struggling to hold it together. Not very shocking by today's standards, but regarded by some as the work of the devil in its day ('sit on this, motherfucker').
Their reign of terror gets worse and worse until they push him too far and he hunts them down and picks them off one by one in a ridiculous but pure money-shot conclusion. I don't even remember seeing Fox in this, and McDowell is priceless as the biology teacher who loses it and brings a gun to class to cajole the bullies with.