International Brigades

The International Brigades (Spanish: Brigadas Internacionales) were soldiers recruited and organized by the Communist International to assist the Popular Front government of the Second Spanish Republic during the Spanish Civil War. The International Brigades existed for two years, from 1936 until 1938. It is estimated that during the entire war, there were some 32,000 Brigaders, yet at no single moment were there more than 18,000 actually deployed. Beyond the Spanish Civil War, "International Brigades" is also sometimes used interchangeably with the term foreign legion in reference to military units comprising foreigners who volunteer to fight in the military of another state, often in times of war.

The headquarters of the brigade was located at the Gran Hotel, Albacete, Castilla-La Mancha. They participated in the battles of Madrid, Jarama, Guadalajara, Brunete, Belchite, Teruel, Aragon, and the Ebro. Most of these ended in defeat. For the last year of its existence, the International Brigades were integrated into the Spanish Republican Army as part of the Spanish Foreign Legion. The organisation was dissolved on 23 September 1938 by Spanish Prime Minister Juan Negrín in a vain attempt to get more support from the liberal democracies on the Non-Intervention Committee.

The International Brigades were strongly supported by the Comintern and represented the Soviet Union's commitment to assisting the Spanish Republic (with arms, logistics, military advisers and the NKVD), just as Portugal, Fascist Italy, and Nazi Germany were assisting the opposing Nationalist insurgency. The largest number of volunteers came from France (where the French Communist Party had many members) and communist exiles from Italy and Germany. Many Jews were part of the brigades, being particularly numerous within the volunteers coming from the United States, Poland, France, Great Britain, and Argentina.

Republican volunteers who were opposed to Stalinism did not join the Brigades. Instead, they enlisted in the separate Popular Front, the POUM (formed from Trotskyist, Bukharinist, and other anti-Stalinist groups, which did not separate Spaniards and foreign volunteers), or anarcho-syndicalist groups such as the Durruti Column, the IWA, and the CNT.

Using foreign communist parties to recruit volunteers for Spain was first proposed in August 1936 by British writer and military theorist Tom Wintringham who had already travelled to Spain, but the idea was not formally raised with the Comintern in the Soviet Union until September 1936—apparently at the suggestion of Maurice Thorez—by Willi Münzenberg, chief of Comintern propaganda for Western Europe. One week after the London meeting of the Non-Intervention Committee confirmed that none of the Western democracies would provide military aid to the Spanish Republican side, the Comintern agreed to start recruiting international volunteers. As a security measure, non-communist volunteers would first be interviewed by an NKVD agent.

By the end of September, the British, Italian and French Communist Parties had decided to set up a column. Luigi Longo, ex-leader of the Italian Communist Youth, was charged to make the necessary arrangements with the Spanish government. The Soviet Ministry of Defense also helped, since they had experience dealing with the corps of international volunteers during the Russian Civil War. The idea was initially opposed by Francisco Largo Caballero, but after the first setbacks of the war, he changed his mind and finally agreed to the operation on 22 October. However, the Soviet Union did not withdraw from the Non-Intervention Committee, probably to avoid diplomatic conflict with France and the United Kingdom.

The main recruitment center was in Paris, under the supervision of Soviet colonel Karol "Walter" Świerczewski. On 17 October 1936, an open letter by Joseph Stalin to José Díaz was published in Mundo Obrero, arguing that victory for the Spanish second republic was a matter not only for Spaniards but also for the whole of "progressive humanity"; in short order, communist activists joined with moderate socialist and liberal groups to form anti-fascist "popular front" militias in several countries, most of them under the control of or influenced by the Comintern.

Entry to Spain was arranged for volunteers, for instance, a Yugoslav, Josip Broz, who would become famous as Marshal Tito, was in Paris to provide assistance, money, and passports for volunteers from Eastern Europe (including numerous Yugoslav volunteers in the Spanish Civil War). Volunteers were sent by train or ship from France to Spain, and sent to the base at Albacete. Many of them also went by themselves to Spain. The volunteers were under no contract, nor defined engagement period, which would later prove a problem.