In grade 6 I had a female PE teacher who was very 'hands on' with the boys. One boy in particular. I stood up for him and the others. But none of the victims or other kids would back me on it.
My Grade 6 teacher homeroom teacher Liked to physically assault us. Take us into the store room and belt us in places that wouldn't show. Even locked a few in a cupboard all through recess before letting them out. Finally though we did get enough of him and although the other teachers and our parents didn't believe us. We took action by just ignoring his existence until he left.
Well, one of the other kids physically tried to fight him on various occasions but this kid was built like a marvel superhero.
Then there was a maths teacher who hated me cause I was the fattest kid in his class and the dumbest. Till he worked out the reason I couldn't keep up was the other kids in class. So he'd have all the classwork ready and send me to detention with it... My Math work greatly improved.