Protest years: In the latter half of the '60s vocal protest against the Vietnam War becomes a familiar backdrop to normal student life. Intensity is greatest in May 1970, following the invasion of Cambodia and the killing of four students at Kent State University in Ohio. Responding to a "call to strike," students and faculty vote overwhelmingly to suspend classes for four days of heightened involvement: leafleting, a Twin Cities march attended by two-thirds of the student body, and daily teach-ins convened at "Bald Spot U." While antiwar activity is visible on campus throughout the Vietnam conflict, Carleton escapes the violent confrontations common elsewhere.