His 'Black Liberation' pastor.
"Their founding document [the Weather Underground's] called for the establishment of a "white fighting force" to be allied with the "Black Liberation Movement" and other "anti-colonial" movements to achieve "the destruction of US imperialism and the achievement of a classless world: world communism."..."-Berger, Dan (2006). Outlaws of America: The Weather Underground and the Politics of Solidarity. AK Press, 95.
Outlaws of America: The Weather Underground and the Politics of Solidarity (Paperback) by Dan Berger
From the New York Times, August 24, 2003
"they [the Weather Underground] employed revolutionary jargon, advocated armed struggle and black liberation and began bombing buildings, taking responsibility for at least 20 attacks. Estimates of their number ranged at times from several dozen to several hundred."
Article: Quieter Lives for 60's Militants, but Intensity of Beliefs Hasn't Faded
From David Horowitz's FrontPageMag.com/DiscoverTheNetworks.org:
"FBI files from 1976, recently made public under the Freedom of Information Act, confirm the connections between Weatherman, Havana, and Moscow. Weatherman leaders like Mark Rudd traveled illegally to Havana in 1968 to engage in terrorist training. There, camps set up by Soviet KGB Colonel Vadim Kotchergine were educating Westerners both in Marxist philosophy and urban warfare."