How can I stop my principal from beating the students at my school?

I work at a special education school where many of the students are nonverbal and our principal is severely beating the kids. She slaps the students in their face, punches them and even encourages her staff to do the same thing. Those staff members who do not hit the children are targeted by her and looked down on because they refuse to beat the students. This type of abuse is going on across the board, the majority of the staff members do it, they hit the students with scissor handles, rulers, and hit the children in their face. I can't take this any more, I have to tell someone but I don't know who to trust. My principal will retaliate so fast and had done so in the past with people who have spoken out against her. You cant even trust the school board because she is well connected and has many friends and ociates who will support her. The parents are not aware because their children can not tell them about what is going on at their school. I thought about contacting Child and Family Services but I am afraid nothing will come of it and I will be fired. Please help, anyone, please tell me what I can do to save these kids from this abuse.