The instant a "protest" switches from 'peaceful and orderly' to hooliganism - immediately confront the protestors with overwhelming force, arrest the violators, order the remaining "protestors" to disperse, and shut the whole thing down before it can develop into more serious law-breaking.
Protestors have the right to assemble & protest P-E-A-C-E-F-U-L-L-Y. They do NOT have the right to break the law (...unless, of course, their name is Clinton or they're buddies of the Clintons.) Once that tenant is violated, school's out..............or 'in' depending on how one chooses to view the LEOs response.
Speaking of crimes, the "Trump University" lawsuit begins this month!
75 Lawsuits Against President-Elect Trump - The Daily Beast