 Complete the following phrase:  The origins of this organization go back to the 1950s, when some former partisans of GAAP Anarchist Groups of Proletarian Action who supported the FCL Libertarian Communist Federation, and who were subsequently expelled from FAI Italian Anarchist Federation because they became Leninists, subsequently joined the group called Azione Comunista. It had been expelled from the Italian Communist Party PCI as a result of the position it had taken in favor of the 