We had one like that when DD was in year 4, they are 17 now and still remember this vile woman
In our case I dismissed it as kids being kids and perhaps they were over egging how bad she was. However one after the other all of the parents would chat and mention this teacher's conduct.
It got so bad that when it was her days for the class (it was a job share role and not ideal in the first place) and she would come out to collect them for the morning, the kids would visibly shrink and become quite noticeably upset
What got rid of her in the end, was me. We had all made complaints and begged school to intervene, they fobbed us off, she was here to stay.
One evening, at pick up, I could hear her shouting at a pupil, not unusual and I was getting my phone out to record it but one of the girls came running out the door into the playground and ran at me. It was my DD being shouted at.
DD at that time was tiny and was facing some bullying as well to make matters worse and I knew she would be hysterical at being screamed at. I went to the door, some of the kids saw me and I put my finger to my lips to say, shhh. I then watched as this abhorrent woman got right in my DDs face, absolutely screaming at her, she was so angry she was incoherent. Three other girls were in tears.
It turned out DD had been kicked and thumped by one of the bullying kids, a boy twice her size, and was crying in pain. This horrid woman then starts shouting at her to be quiet and put her chair away, so DD had pushed the boy as he was stopping her from doing as she was told. Of course, despite being entirely ignorant of DD being battered, she saw her push him and had demanded DD apologise. When she said no, she had dragged DD to the front and started her verbal diatribe.
Hearing enough, I coughed and said "are you quite finished?" To say she absolutely shit herself that she had finally been caught out by a parent. I recorded it, the whole screaming from her.
Took it straight to the headteacher, never saw the teacher again. We had supply teachers after that. Kids went back to not fearing a teacher.