A period of profound social and political changes, the democratic transition that followed the 1974 military coup in Portugal had an enormous impact on social work. The Revolution set the ideal conditions for social workers to perform alternative forms of intervention, moving away from the assistance-focused practices characteristic of the former authoritarian rule. Incited by the new progressive political agenda, social workers stood at the forefront of the Revolution, working alongside grass-roots mobilisations and experimental participative projects, overtly assuming political stands. This article analyses the agency of social workers in the various political and social fronts during the democratic transition.