Introduction: actions, ideas, and emotions in the construction of a transnational radicalism in the Southern Cone -- Revolution without the Sierra Maestra: the Tupamaros and the development of a repertoire of dissent for urbanized countries. Montevideo, 1962-1968 -- The subjective bonds of revolutionary solidarity. From Havana to Ancahuazú (Bolivia), 1967 -- Dependence or armed struggle. Southern Cone intellectuals and militants questioning the legal path to socialism. Santiago de Chile 1970-1973 -- '"The decisive round in Latin America's revolution" -- Bolivian, Chilean, and Uruguayan activists in Peronist Argentina. Buenos Aires, 1973-1976 -- Surviving democracy. The transition from armed struggle to human rights (1981-1989) -- Conclusion: Revolutionaries without revolution.