Colby students march in protest of the Vietnam War in the fall of 1969.

In this photo from May 10, 1970, Charles Terrell confronts Sen. Margaret Chase Smith when she spoke to students at Colby College six days after four students were killed by Ohio National Guardsmen at Kent State University in Ohio.

Charles Terrell, right, leaves Colby’s Lorimer Chapel after he convinced his fellow protesters that the Students Organization for Black Unity had made their point staging a week-long sit-in in March 1970. Terrell has since served as a trustee of the college and was a member of the committee that hired David Greene.

Students from other Maine campuses joined Colby students in Waterville on May 10, 1970, to hear what Sen. Margaret Chase Smith had to say about the secret bombing of Cambodia, the war in Vietnam and the killing of four students by the Ohio National Guard at Kent State University in Ohio six days earlier.

Colby students meet to discuss going out on strike to protest secret bombings in Cambodia, the war in Vietnam and the killing of four students by Ohio National Guardsmen on May 4, 1970.

Mark Zaccaria, Colby College Class of 1970, now.

Mark Zaccaria, taken in his senior year at Colby.

Colby students march in protest of the Vietnam War. In May 1970 students decided to go on strike and shut down the campus, prompted by the killing of four students at Kent State University in Ohio by members of the Ohio National Guard on May 4, 1970.

Colby students protest the Vietnam War during the 1969-70 school year. In May 1970 students decided to go on strike and shut down the campus, prompted by the killing of four students at Kent State University in Ohio by members of the Ohio National Guard on May 4, 1970.