Hoffman was a leading figure in the counterculture movement of the 1960s and '70s, founding the Youth International Party and being active in the "flower power" movement. He was also an anti-war activist during the Vietnam War era, with a particular knack for performance. In the years following the Chicago Seven trial, Hoffman became an even more controversial figure, writing books and continuing to protest — at one point, he was even arrested protesting the CIA's actions alongside President Carter's daughter Amy! He died by suicide in 1989.