The accelerated pace of decolonization by the 1950s led many Britons to engage with questions of colonial nationalism. The Movement for Colonial Freedom (MCF) was one of the largest postwar British civil society associations that addressed these questions. This chapter examines the MCF’s work as an international advocacy organization and a central node in transnational anti-colonial networks. It highlights similarities between the MCF and the initiatives pursued by some of the UN’s development agencies. It addresses the MCF's assistance to colonial nationalist movements in Africa, its role as an ally and supporter of African human rights activists, and its active role in identifying and combatting racism as a political and human rights problem at home in Britain.