Finally got around to this one. About halfway through it. Not just the weathermen but also the BLA and the SLA that kidnapped patty hearst. How these groups recruited and survived is much of the story. I find it very interesting that they could travel about almost freely without much interference for the most part.I read this book a couple of years ago but forgot about it.
DAYS OF RAGE by Bryan Burrough
It's the history of the Weather Underground, a domestic left-wing terror group in the U.S. in the late 60s and early 70s.
It started from the Vietnam war protestors and they wound up setting off bombs, burning buildings and assassinating police officers.