If I was sitting in the living room of another persons house and that person was telling me to leave, but I refused to do so, then the term "assault" would be debatable. These students were on private property and were told to disperse. They didn't.
Just because you think it was wrong doesn't make it illegal. I was asking a legitimate question in attempt to gain all the facts of the situation before I passed any sort of judgment. In California, is there a law stating this is not an acceptable method to break up non-violent protesters? It is entirely possible that this police officer did was not illegal and in fact, an "authorized" method of handling the situation. I'm not defending him. I'm just asking for the facts. If this is the case, no need to go around accusing him of criminal behavior. If anything, he is a pathetic excuse for a human being who likes to bully people.