He was a sixties radical, by 1970 he was already in hiding for what he had done. The Weathermen came from SDS.
“Ayers became involved in the New Left and the Students for a Democratic Society (SDS).[7] He rose to national prominence as an SDS leader in 1968 and 1969. As head of an SDS regional group, the “Jesse James Gang”, Ayers made decisive contributions to the Weatherman orientation toward militancy.[5]The group Ayers headed in Detroit, Michigan became one of the earliest gatherings of what became the Weatherman. Between the 1968 Democratic National Convention in Chicago and the June 1969 SDS convention, Ayers became a prominent leader of the group, which arose as a result of a schism in SDS.[5]”During that time his infatuation with street fighting grew and he developed a language of confrontational militancy that became more and more pronounced over the year [1969]”, disaffected former Weatherman member Cathy Wilkerson wrote in 2001. Ayers had previously become a roommate of Terry Robbins, a fellow militant, Wilkerson wrote. Robbins would later be killed while making a bomb.[8]In June 1969, the Weatherman took control of the SDS at its national convention, where Ayers was elected Education Secretary.[5] Later in 1969, Ayers participated in planting a bomb at a statue dedicated to riot police casualties in the 1886 Haymarket Riot confrontation between labor supporters and the police.”
“In 1970 he “went underground” with several associates after the Greenwich Village townhouse explosion, in which Weatherman member Ted Gold, Ayers’ close friend Terry Robbins, and Ayers’ girlfriend, Diana Oughton, were killed when a nail bomb (an anti-personnel device) they were assembling exploded. “
The bombings occrued in the 1970s (the Pentagon was bombed in 1972). He was a 1970s terrorist. Just as the Unabaomber was.