stores for goods that took the same amount of time to produce". Warren put his theories to the test by establishing an experimental "labor for labor store" called the Cincinnati Time Store where trade was facilitated by notes backed by a promise to perform labor. The store proved successful and operated for three years after which it was closed so that Warren could pursue establishing colonies based on mutualism. These included Utopia and Modern Times. Warren said that Stephen Pearl Andrews' The Science of Society, published in 1852, was the most lucid and complete exposition of Warren's own theories. In Europe, an early anarcho-communist was Joseph Déjacque, the first person to describe himself as "libertarian". Unlike and against Proudhon, he argued that "it is not the product of his or her labor that the worker has a right to, but to the satisfaction of his or her needs, whatever may be their nature". Returning to New York, he was able to serialise his book in his periodical Le Libertaire, Journal du Mouvement social. Published in twenty-seven issues from 9 June 1858 to 4 February 1861, Le Libertaire was the first anarcho-communist journal published in the United States. Economics in organized mass social anarchism The anti-authoritarian sections of the First International proclaimed at the St. Imier Congress (1872) that "the aspirations of the proletariat can have no purpose other than the establishment of an absolutely free economic organization and federation, founded upon the labour and equality of all and absolutely independent of all political government" in which each worker will have the "right to the enjoyment of the gross product of his labours and thereby the means of developing his full intellectual, material and moral powers in a collective setting". This revolutionary transformation could "only be the outcome of the spontaneous action of the proletariat itself, its trades bodies and the autonomous communes". Due to its links to active workers' movements, the International became a significant organization. Karl Marx became a leading figure in the International and a member of its General Council. Proudhon's followers, the mutualists, opposed Marx's state socialism, advocating political abstentionism and small property holdings. In 1868, following their unsuccessful participation in the League of Peace and Freedom (LPF), Russian revolutionary Mikhail Bakunin and his collectivist anarchist associates joined the First International (which had decided not to get involved with the LPF). They allied themselves with the federalist