The delegates of the communist fraction walked out if the PSI Congress singing of the Internationale and, following Bordiga, proceeded to hold the founding Congress of the Communist Party at the :it:Teatro San Marco. It was a makeshift arrangement: the building, used as a warehouse for materials of the Royal Italian Army during the First World War, had no seats, and the delegates sheltered with umbrellas from the rain that entered through the broken glass of the windows and from the holes in the roof.
