"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[1] 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.
http://en.wikipedia.org/wiki/Weatherman_Underground#cite_ref-Berger_0-0
Outlaws of America: The Weather Underground and the Politics of Solidarity (Paperback) by Dan Berger
http://www.amazon.com/Outlaws-America-Underground-Politics-Solidarity/dp/1904859410
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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
http://query.nytimes.com/gst/fullpage.html?res=9F04E4DE1539F937A1575BC0A9659C8B63&sec=&spon=&pagewanted=2
Source: TIME Magazine:
http://www.time.com/time/quotes/0,26174,1857184,00.html
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"The raised fist (also known as the clenched fist) is a salute and logo most often used by left-wing activists, such as: Marxists, anarchists, socialists, communists, pacifists, trade unionists, and black nationalists. The raised fist is usually regarded as an expression of solidarity, strength or defiance."