I wanted to list a few articles that discuss issues of child abuse specifically by teachers. This is not an easy subject to find a lot of information on but it is out there if you look. I will try to get permission to post some journal articles later.
Teacher's verbal abuse can lead to problem behavior
Teachers’ Powerful Words
Fact Sheet: Emotional Child Abuse
Here some other interesting Links.
Kindergarden Teacher
Verbal abuse by teacher
Spy Cam