At the weekend of February 16 and 17, thousands of workers, unemployed, and members of the popular assemblies, met in the Argentinean capital Buenos Aires for the National Assembly of Workers. This meeting is the highest point so far of the movement towards the creation of an alternative power of the workers and the masses in Argentina. The movement, which started with the revolutionary events of December 19 and 20, has advanced very rapidly not only in its organisational forms but also in the political conclusions that it has drawn. By Jordi Martorell, with a footnote by Alan Woods.