Why are the Constitutionally protected rights of peaceful assembly being violated by police on US college campuses?

It is appalling to see student protesters against the Israeli siege of Gaza being brutally beaten, dragged off and arrested by police on US college campuses nationwide. Why are the Constitutionally protected rights to peaceful assembly being violated by police on these college campuses? What are the students demanding other than an immediate cease fire in Gaza and the US stop funding the Israeli war machine.