"Revolutions without theory fail to make progress. We of the 'Friends Of Durruti' have outlined our thinking, which may be amended as appropriate in great social upheavals but which hinges upon two essential points which cannot be avoided. A program, and rifles."-- El Amigo del Pueblo , No. 5, July 20, 1937. Spain 1936-1939: This is the story of a group of anarchists engaged in the most thoroughgoing social and economic revolution of all time. Essentially...