CSSN is the umbrella organization for all left and progressive groups on campus. We work to unite campus activists and organizers by providing a site for the free flow of ideas and strategies between and across activist clusters. More materially, we provide resources and support for activist efforts, on campus and off. CSSN also serves as the public face of Columbia activism in New York: we help students to get in touch with radical movements in the greater city, with which they might otherwise have difficulty getting in touch. Thanks to CSSN, we have built the left into a major force at Columbia.