Narratives of the 1960s typically describe an ascending arc of political activism that peaked in 1968, then began a precipitous descent as the revolutionary dreams of the New Left failed to come to fruition. The May 1970 killings at Kent State often stand as an epitaph to a decade of protest, after which the principal story becomes the resurgence of the right. In Beyond Vietnam: The Politics of Protest in Massachusetts, 1974-1990, Robert...