Students for a Democratic Society (SDS) being the group that spawned Bill Ayers’ domestic terrorist group the Weather Underground.

Via New York Observer:

Todd Gitlin, former president of SDS and a professor of social history at Columbia University, will write a book called Liberty Square, to be published by HarperCollins imprint It Books. The announcement posted yesterday on Publishers Marketplace describes it as “a look at the Occupy movement at its pivotal moment, as it weighs its unexpected power and grapples with its future mission.”