Foreign communists have had far more success than that. It was they who helped end the war in Vietnam allowing the North to seize control of the South. The "anti-war" movement worked with the North Vietnamese and the KGB to bring about that goal.
"In July 1969, Bernardine Dohrn [Ayers' co-terrorist wife], Eleanor Raskin, Dianne Donghi, Peter Clapp, David Millstone and Diana Oughton, all representing 'Weatherman', as Dohrn's faction was now called, traveled to Cuba and met with representatives of the North Vietnamese and Cuban governments."
http://en.wikipedia.org/wiki/Bernardine_Dohrn
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
June, 1970 -- Kerry joins Vietnam Veterans Against the War (VVAW), a national veterans group that is part of the Peoples Coalition for Peace and Justice. The PCPJ is a broad coalition of local and national organizations, including the Communist Party, USA, "committed to conducting demonstrations aimed at ending the war in Indochina, and poverty, racism and injustice at home." The VVAW, CCI and PCPJ all have headquarters at 156 Fifth Avenue in New York City. VVAW Executive Secretary Al Hubbard, a former Black Panther, is also on the coordinating committee of the PCPJ. Hubbard soon appoints Kerry to the VVAW's Executive Committee, bypassing the normal election process.[note: today-2008, Communist Party USA has a comparatively new "peace" group around called 'United for Peace and Justice'. Sound familiar?]
July 27, 1970: The United States Army base at The Presidio in San Francisco is bombed on the 11th anniversary of the Cuban Revolution. [NYTimes, 7/27/70] :
Chronology of Weather Underground attacks:
http://en.wikipedia.org/wiki/Weatherman_(organization)#Chronology_of_events
November 22, 1970 -- During a fund-raising tour for GI deserters, Vietnam Veterans Against the War and the Black Panthers, Jane Fonda is quoted in the Detroit Free Press as telling a University of Michigan audience:
"I would think that if you understood what communism was, you would hope, you would pray on your knees that we would someday become communist," and "The peace proposal of the Viet Cong is the only honorable, just, possible way to achieve peace in Vietnam."
http://www.wintersoldier.com/index.php?topic=Timeline
Fonda made the following statement at the University of Texas:
"We've got to establish a Socialist economic structure that will limit private profit-oriented businesses. Whether the transition is peaceful depends on the way our present governmental leaders react. We must commit our lives to this transition ...... We should be very proud of our new breed of soldier. It's not organized but it's mutiny, and they have every right." --Karen Elliott Dallas Morning News December 11, 1971
John Kerry and the VVAW--Hanoi's American Puppets?
"Two recently discovered documents captured from the Vietnamese communists during the Vietnam War strongly support the contention that a close link existed between the Hanoi regime and the Vietnam Veterans Against the War (VVAW) while John Kerry served as the group's leading national spokesman."
http://www.wintersoldier.com/staticpages/index.php?page=puppets
Vietnam Veterans Against the War (VVAW) Complete FBI files:
http://www.wintersoldier.com/index.php?topic=VVAWFBI