Basically, the group that brought the right to vote to African-Americans in the South. Had important members some of whom went on to become more militant, but if you read Howard Zinn's SNCC: The New Abolitionists you will get a good perspective on the group before the issue of skin color began to separate its core members.
These people defined the best and perhaps the worst sides of 60's student activism. They were also responsible in part for the Crisis at Columbia, and some other things. Mostly because many white people in power hate to see black people speak out for the freedoms that whites take for granted.
More proactive and younger than the NAACP, everyone under 25 should study this organization.