Spain Betrayed provides full documentation of the Soviets' activities during the Spanish Civil War. Documents in the book reveal that the Soviet Union not only swindled the Spanish Republic out of millions of dollars through arms deals but also sought to take over and run the Spanish economy, government, and armed forces in order to make Spain a Soviet possession, thereby effectively destroying the foundations of authentic Spanish antifascism. The documents also shed light on many other disputed episodes of the war: the timing of the Republican request for assistance from the Soviet Union; the rise and fall of the International Brigades; the internal workings of the Comintern and its influence on Spain; and much more.