Students stormed the stage at Columbia University’s Roone auditorium yesterday, knocking over chairs and tables and attacking Jim Gilchrist, the founder of the Minutemen, a group that patrols the border between America and Mexico.

Students stormed the stage at Columbia University’s Roone auditorium yesterday, knocking over chairs and tables and attacking Jim Gilchrist, the founder of the Minutemen, a group that patrols the border between America and Mexico.