Students for a Democratic Society (SDS) was the principal campus radical organization of the 1960s. When SDS first took form in 1960-62 under the leadership of Al Haber and Tom Hayden, it was a small organization of a few hundred members. By the time the author joined the Reed College chapter as a freshman in 1968, SDS had grown into a very large organization--at least by the standards of the American left--with perhaps as many as 100,000 members. But by that time, leaders of SDS, if not all of its rank and file, had largely forgotten the organization's original goals and values. Leaders of a faction known as Weatherman shut down the organization. So when the author heard that a new SDS was in the offing, he felt that even if the organizers were determined to avoid a repetition of past disasters, it would still prove a mistake to revive an organization whose very name imposed on its members the necessity of constantly explaining to skeptical outsiders that, no, it wasn't the SDS of 1969 they sought to emulate, but that of earlier, saner years. This article explains the distinctions between SDS in 1960s and SDS in 2006.