The papers of Spanish anarchist and poet Federico Arcos (1920-2015) comprise Arcos' correspondence, official papers, audiovisual materials, and photographs. After fleeing fascist Spain, Arcos resided in France and in Ontario, Canada. His papers reflect his international anarchist network and his connections with Detroit-area anarchists. In addition to his own personal papers, Arcos also preserved original and photocopied archives on the history of the Spanish Civil War and anarchism. Thus included in Arcos' papers are CNT-AIT records and a set of original letters to and from Emma Goldman, whom Arcos greatly admired, but never met.