Ah, let us compare the activities of the two:
Weather Underground Deaths: At least 5.
Tea Party Deaths [to Date]: None.
Does that '5' include the deaths of the 3 shot to death in the '83 Brinks truck robbery? It was a joint attack between the Weather Underground and Black Liberation Army (BLA). They often carried out attacks together. The BLA is also believed to have been involved in the bombing of the San Fran police station in the 70s. Two police officers I believe were murdered there, and at least one other maimed. Ayers himself actually implicated his co-terrorist wife, Bernardine Dohrn, in building and planting the bomb. The case was thrown out because of "improper wiretapping".