 While in Barcelona again, he met with painter Josep Lluís Pellicer and his cousin, Rafael Farga Pellicer along with others who were to play an important role establishing the International in Barcelona, as well as the Alliance section.During the 1867–1868 period, Bakunin responded to Émile Acollas's call and became involved in the League of Peace and Freedom (LPF), for which he wrote a lengthy essay "Federalism, Socialism, and Anti-Theologism" Here he advocated a federalist socialism, drawing on the work of Proudhon.He supported freedom of association and the right of secession for each unit of the federation, but emphasized that this freedom must be joined with socialism for "[l]iberty without socialism is privilege, injustice; socialism without liberty is slavery and brutality".