In 1922, the Russian Comintern provided $300,000 for the spreading of communist propaganda among Negroes. In 1925, the Communist Party U.S.A. told its members:
“The aim of our Party in our work among the Negro masses is to create a powerful proletarian movement which will fight and lead the struggle of the Negro race against the exploitation and oppression in every form and which will be a militant part of the revolutionary movement of the whole American working class ... and connect them with the struggles of national minorities and colonial peoples of all the world and thereby the cause of world revolution and the dictatorship of the proletariat.”
http://www.modernhistoryproject.org/mhp/ArticleDisplay.php?Article=FinalWarn04
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."
http://www.discoverthenetworks.org/groupProfile.asp?grpid=6808
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"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