Analysis of popular participation in government interventions in MedellínColombia, from 1980, in historical contexts of increasing urban informality and illegality. The central argument focuses in the relation between precarious condition, participation and interventions, deriving potentialities for the collective construction of city, framed by the recognition of the social fight as a condition that pre-exists, subsists and transcends the same urban intervention, strengthening it. The article derived as result of qualitative social research, of documentary type.Se analiza la participación popular en intervenciones gubernamentales en Medellín, Colombia, realizadas desde 1980 hasta la actualidad, en contextos históricos de creciente precarie...