Most schools give all parents a copy of their handbook at the start of the year, and a clear "disciplinary policy" is usually stated within it. At my son's school, it states what kinds of behaviors are unacceptable, and what kinds of actions will be taken for violations... All situations that involve physical contact must have an "incident report" written up, and a copy is sent home to both the family of the child who "started it" and the family of the child who is "targeted." The report must be signed by parents and returned to school officials, acknowledging that they are aware of the matter.

What you describe sounds more like a lack of discipline within a specific class, and maybe that has to do with a lack of teacher training and/or the need for an aide in the classroom. It is vital to have a written documentation record of what's occurring, to avoid "he said, she said" arguements. For example, you could send a letter to the principal stating that "On (day, date) my daughter (name), a student in (Mrs. X's 3rd grade class) came home upset again. She reported that several classmates (names, if known) continue to disrupt the class with (their ongoing fighting and pushing and verbal outbursts) and (Mrs. X) seems unable to control them. Yesterday they pushed my daughter, resulting in a visit to the School Nurse (Mrs. Y) I spoke to (Dean Z) about this type of uncontrolled behavior earlier in the year, and feel that the safety of all children and providing a peaceful learning enviroment is critical. (Mrs. X) needs assistance in her classroom, and I believe (an aide could be helpful.) I would like to know what will be done to ensure this is provided asap. Sincerely, (your name)

If you don't get a response in a week or so, send a copy of the letter to your School District Superintendent, stating that you believe the matter of children's safety and security is too important to ignore, and since you haven't heard from the Principal, you are asking how it will be handled at the District level...