Students for a Democratic Society (SDS) was a national student activist organization in the United States during the 1960s and was one of the principal representations of the New Left. Disdaining permanent leaders, hierarchical relationships and parliamentary procedure, the founders conceived of the organization as a broad exercise in "participatory democracy". From its launch in 1960 it grew rapidly in the course of the tumultuous decade with over 300 campus chapters and 30,000 supporters recorded nationwide by its last national convention in 1969. The organization splintered at that convention amidst rivalry between factions seeking to impose national leadership and direction, and disputing "revolutionary" positions on, among other issues, the Vietnam War and Black Power.

The New Left was a broad political movement that emerged from the counterculture of the 1960s and continued through the 1970s. It consisted of activists in the Western world who campaigned for a broad range of social issues such as feminism, gay rights, drug policy reforms and the rejection of traditional family values, social order, and gender roles. The New Left differs from the traditional left in that it tended to acknowledge the struggle for various forms of social justice, whereas previous movements prioritized explicitly economic goals. However, many have used the term "New Left" to describe an evolution, continuation, and revitalization of traditional leftist goals.