 His first semester at Columbia, Jacobs met fellow freshman Mark Rudd, and the two became friends.J.J., as most people at Columbia called him, soon joined Students for a Democratic Society (SDS).The Columbia University chapter of SDS had been founded in the 1950s as part of the Student League for Industrial Democracy, the youth arm of the League for Industrial Democracy (a social democratic organization co-founded by Jack London, Norman Thomas, Upton Sinclair and others).