It was common in the public schools, too. In fourth grade in my public school, I saw a teacher break a girl’s wrist by shaking her and then slamming her across against the blackboard.
The gym teacher routinely disciplined the boys by making them bend over and then kicking their backsides.
Discipline was simply a lot harsher in all school settings until the last few decades.
Discipline? Let’s call it what it is: abuse!