When World War I broke out, the socialists met on 4th August 1914 to engage the struggle for internationalism and against the war: there were seven of them in Rosa Luxemburg's apartment. This reminiscence, which reminds us that the ability to swim against the current is one of the most important of revolutionary qualities, should not lead us to conclude that the role of the proletarian party was peripheral to the events which shook the world at that time...