On May 15, 1906, Recabarren was elected as a deputy for Tocopilla to the National Congress representing the Democrat Party. He was prevented though from assuming his position because he refused to be sworn on a bible, based on his atheism. He moved his family to Iquique. Heavily involved in the labour movement, organising workers both politically and industrially, as a consequence of which he was re-prosecuted by the government and had to escape to Argentina. In that country he joined the Socialist Party of Argentina and in 1908 he travelled to Europe (Spain, France and Belgium), finally returning to Chile at the end of that year.