Which militant radical left-wing organization, founded on the Ann Arbor campus of the University of Michigan, included David Gilbert among its members?
David Gilbert (activist):  Gilbert was a founding member of Columbia University Students for a Democratic Society and member of the Weather Underground Organization. Weather Underground: The Weather Underground Organization (WUO), commonly known as the Weather Underground, was an American militant radical left-wing organization founded on the Ann Arbor campus of the University of Michigan.
The Weather Underground Organization