The events in Yugoslavia represent a political earthquake. In the space of 24 hours the entire situation has been transformed. The decisive element in the equation has been the sudden eruption of the masses on the scene. The scenes of an avalanche of humanity descending on Belgrade, the strikes, the confrontations with the police, the storming of the Parliament, have captured the imagination of the world. What is the meaning of the events in Yugoslavia? What is the nature of this movement? And what attitude should Marxists take towards it?