On 16 July 1984, Comrade Nahuel Moreno was invited by the Socialist Youth of MAS to give a talk about organisational issues of the revolutionary party. The text that follows is the corrected transcript. Moreno made a quick tour of the theory and history of the revolutionary workers’ organisation and its importance, from Marx to the setback caused by the Stalinist bureaucracy. In the second part, he referred exhaustively to the questions of organisational building of the party. He warned about sectarian traits and how to combat them, as well as the risks of falling into opportunism.