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From the Wiki article about it, above is the logo of the Weather Underground, and its leaders were Bill Ayers and Bernadine Dohrn.
Ayers and Dohrn, from etsmnews.wordpress.com.
According to G. Edward Griffin, in the documentary No Place to Hide (section from 24:30 - 24:47), "the Weather Underground organization officially describes itself as follows:"
... a revolutionary organization of Communist men and women ... our goal is the destruction of U.S. imperialism and the achievement of a classless state: world Communism.
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