The most influential thinkers there were Stirner, Émile Armand and Han Ryner. Just as in France, Esperanto, anationalism, anarcho-naturism and free love were present as philosophies and practices within Spanish individualist anarchist circles. Later Armand and Ryner started publishing in the Spanish individualist press. Armand's concept of amorous camaraderie had an important role in motivating polyamory as realization of the individual. Recently historian Xavier Diez wrote on the subject in "El anarquismo individualista en España: 1923-1938" y "Utopia sexual a la prensa anarquista de Catalunya. La revista Ética-Iniciales(1927–1937)" deals with free love thought in "Iniciales". Diez reports that the Spanish individualist anarchist press was widely read by members of anarcho-communist groups and by members of the anarcho-syndicalist trade union CNT. There were also the cases of prominent individualist anarchists such as Federico Urales and Miguel Gimenez Igualada who were members of the CNT and J. Elizalde who was a founding member and first secretary of the Iberian Anarchist Federation. Federico Urales was an important Catalan individualist anarchist who edited "La Revista Blanca". The individualist anarchism of Urales was influenced by Auguste Comte and Charles Darwin. He saw science and reason as a defense against blind servitude to authority. He was critical of influential individualist thinkers such as Nietzsche and Stirner for promoting an asocial egoist individualism and instead promoted an individualism with solidarity as a way to guarantee social equality and harmony. In the subject of organization he was highly critical of anarcho-syndicalism as he saw it plagued by too much bureaucracy and thought that it tended towards reformism. He instead favored small groups based on ideological alignment. He supported the establishment of the Iberian Anarchist Federation (FAI) in 1927 and participated in it. An important Spanish individualist anarchist was Miguel Giménez Igualada who wrote the lengthy theory book called "Anarchism" espousing his individualist anarchism. Between October 1937 and February 1938 he started as editor of the individualist anarchist magazine "Nosotros", in which many works of Han Ryner and Émile Armand appeared, and also participated in the publishing of another individualist anarchist magazine "Al Margen: Publicación quincenal individualista".