Tom Hayden was a radical left-wing American activist who died in October 2016. He initially became famous as the principal author of the 1962 Port Huron Statement, a founding document of the Students for a Democratic Society, which promoted a vague notion of “participatory democracy” and criticized U.S. Cold War foreign policy. He became more famous as an anti-Vietnam War leader, first by making a pilgrimage to Hanoi in 1965, next by helping to organize what became violent demonstrations at the Democratic Party’s 1968 convention in Chicago, and later by marrying and working with Jane Fonda to defeat American policy in...