The group that spawned Bill Ayers’ Weather Underground, the Students for a Democratic Society (SDS) attended Occupy’s NATO rage-fest.

CHICAGO, IL — MAY 19: Protesters, some affiliated with the Occupy Wall Street movement, demonstrate in downtown Chicago on the eve of the NATO summit on May 19, 2012 in Chicago, Illinois. Sixty heads of state, 2,500 journalists and thousands of protesters have converged on Chicago for the two day NATO meeting which begins on Sunday and will look to address the situation in Afghanistan among other global defense issues. Chicago police are preparing for the worst with many officers in riot gear and with their numbers enhanced by police from outside the city. (Photo by Spencer Platt/Getty Images)