 On 15 April 1879 he was again sentenced to two months of prison, then expelled from Switzerland for having published an article in "L'Avant-Garde" which legitimized the propaganda of the deed attempts of Giovanni Passannante, Juan Oliva Moncasi, Max Hödel and Karl Nobiling.Paul Brousse returned to France in 1880 and progressively became more reformist.He began to take part in the French Workers' Party (POF) and then, after a scission, to the Federation of the Socialist Workers of France (FTSF), which became known as the "possibilists".