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 Giménez Igualada who were members of the CNT and J. Elizalde who was a founding member and first secretary of the Iberian Anarchist Federation. 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 , in which many works of Han Ryner and Émile Armand appeared, and also participated in the publishing of another individualist anarchist magazine . In his youth he engaged in illegalist activities. Igualada's thought was deeply influenced by Stirner, of which he was the main popularizer in Spain through his writings. He published and wrote the preface to the fourth edition in Spanish of The Ego and Its Own from 1900. He proposed the creation of a Union of Egoists, a Federation of Individualist Anarchists in Spain, but did not succeed. In 1956, Igualada published an extensive treatise on Stirner, which he dedicated to fellow individualist anarchist Émile Armand. Afterwards, he travelled and lived in Argentina, Uruguay and Mexico. Anarcho-naturism Anarcho-naturism was quite important at the end of the 1920s in the Spanish anarchist movement In France, later important propagandists of anarcho-naturism include Henri Zisly and Émile Gravelle who collaborated in , , , , and . Their ideas were important in individualist anarchist circles in France as well as Spain, where Federico Urales (pseudonym of Joan Montseny) promoted the ideas of Gravelle and Zisly in (1898–1905). Isaac Puente, an influential Spanish anarchist during the 1920s and 1930s and an important propagandist of anarcho-naturism, was a militant of both the CNT anarcho-syndicalist trade union and Iberian Anarchist Federation. He published the book (en:Libertarian Communism and other insurrectionary and naturist proclaims) in 1933, which sold around 100,000 copies, and wrote the final document for the Extraordinary Confederal Congress of Zaragoza of 1936 which established the main political line for the CNT for that year. Puente was a doctor who approached his medical practice from a naturist point of view. He saw naturism as an integral solution for the working classes, alongside Neo-Malthusianism, and believed it concerned the living being while anarchism addressed the social being. He believed capitalist societies endangered the well-being of humans