I watched Rudd talk about his book about the weather underground on C-SPAN last weekend. It seems clear that Dohrn was the leading advoctae of violent actions amongst the leaders.
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