The ISS which was a student organization became the LID which appealed to socialists throughout society.
Later a student group split off from LID: SLID. This ultimately became the SDS.
Meanwhile LID is still around, but parts of it combined with the Socialist Party to become SDUSA a "social democratic" organization.
Although LID did some good things like support the Solidarity movement in Poland this seems more in support of trade unions and in keeping with the American trade union tradition of strong opposition to communism.
The really interesting thing is that neoconservatives played a major role in LID and even SDUSA. This may explain why neocons are right with regard to communism, but wrong with regard to pretty much everything else.
But at what cost? Increased tyranny and decreased economic progress