Okay, that's a hyperbolic statement, but when you get in the mindset of the radical left of the 1960s and 1970s you tend to get a little grand in your rhetoric. The Weather Underground, if you don't know, was the anti-Vietnam youth movement so sickened by the US's foreign policy that they felt they had to “bring the war home” with acts of domestic terrorism. In real life, they called ahead to warn of bombs in government buildings – and the only blood they shed was their own during an explosives accident in a Greenwich Village apartment – but for the movies, even one by a bonafide liberal like Robert Redford, it is easy to paint them as people who let their ideals take them too far.