Fourth Congress. First Session. Volume 6. Federal Bureau of Investigation. 1976, Exhibit 68-13., cited in ''Communism in Chicago and the Obama Connection'', Cliff Kincaid and Herbert Romerstein, usasurvival.org</ref> The ringleaders, principally [[Weather Underground]] terrorists, received urban guerilla warfare training in Cuba from the [[DGI]] prior to the attacks.<ref>[http://www.usasurvival.org/docs/Cuban_DGI.pdf Final Talk to the Fourth Contingent, Julian Rizo DGI.]</ref> ]] | Fourth Congress. First Session. Volume 6. Federal Bureau of Investigation. 1976, Exhibit 68-13., cited in ''Communism in Chicago and the Obama Connection'', Cliff Kincaid and Herbert Romerstein, usasurvival.org</ref> The ringleaders, principally [[Weather Underground]] terrorists, received urban guerilla warfare training in Cuba from the [[DGI]] prior to the attacks.<ref>[http://www.usasurvival.org/docs/Cuban_DGI.pdf Final Talk to the Fourth Contingent, Julian Rizo DGI.]</ref> ]] |