Luckily, the Weather Underground, at least while still technically an organization, never killed anyone. However, they certainly tried. Here's one example:
From David Horowitz's FrontPageMag.com/DiscoverTheNetworks.org:
March 6, 1970: "three members of the Weather Underground accidentally killed themselves in a Manhattan townhouse while attempting to build a powerful bomb they had intended to plant at a social dance in Fort Dix, New Jersey -- an event that was to be attended by U.S. Army soldiers. Hundreds of lives could have been lost had the plot been successfully executed."
http://www.discoverthenetworks.org/groupProfile.asp?grpid=6808
"The bomb was intended to be planted at a non-commissioned officer's dance at Fort Dix, New Jersey.
The bomb was packed with nails to inflict maximum casualties upon detonation."
http://en.wikipedia.org/wiki/Weatherman_(organization)#Chronology_of_events
Bill Ayers TODAY (April 6, 2008), from his own red communist star-headed website, begging to debate communism vs capitalism with Sean Hannity and STILL calling for revolution!
"Imperialism. I’m against it, and if Sean Hannity and others were honest, this is the ground they would fight me on. Capitalism played its role historically and is exhausted as a force for progress: built on exploitation, theft, conquest, war, and racism, capitalism and imperialism must be defeated and a world revolution—a revolution against war and racism and materialism, a revolution based on human solidarity and love, cooperation and the common good —must win.
We begin by releasing our most hopeful dreams and our most radical imaginations: a better world is both possible and necessary.
Source: Bill Ayers' own website:
http://billayers.wordpress.com/2008/04/page/2/
'Guilty as hell, free as a bird—America is a great country,' he [Ayers] said."
August 2001, Chicago Magazine (article: No Regrets)
http://www.chicagomag.com/Chicago-Magazine/August-2001/No-Regrets/