Anarchist Socialism in Early 20th Century Spain is the first English translation of and critical introduction to Ideario, a collection of newspaper and journal articles written by Spanish anarchist Ricardo Mella. Given that Mella is virtually unknown to the English-speaking world, this book provides readers access to his extensive body of work about Spain, human nature, and a world increasingly dominated by capitalism. Suitable for both the general public interested in learning more about anarchist ideas and for scholars studying twentieth-century Spain, the three introductory essays help to introduce Mella, ground his work in the context of Spanish anarchism, and draw connections between Mella and the urban in late nineteenth- and early twentieth-century Spain. Stephen Luis Vilaseca’s translation is accessible and engaging.