Well I've had a look at TV footage, and it all seems like an organised attempt to disrupt a perfectly legal political rally.
If people disagree on policies of other candidates they are free to say so, to hold rallies of their own and put the alternative case. To stop political meetings being held because one does not like the views of the organisers, is something completely different.
If the shoe was on the other foot and large groups of hooligans were disrupting Mrs Clintons meetings.....this place would be seething.