Los Solidarios ("Solidarity"), also known as Crisol ("Crucible"), was a Spanish anarchist armed-struggle group founded in 1922 or 1923 in Barcelona, as a reply to the 'dirty war' strategy used by the employers and government against trade unions.
After that, and pressured by the Primo de Rivera dictatorship, Buenaventura Durruti, Francisco Ascaso and other members fled to France, and then to Latin America, where they were charged with more robberies.