The history of the International Federation of Resistance Fighters (FIR) is inseparably linked to internationalism in the anti-fascist struggle of the peoples. Internationalism was and remains the answer to the nationalist and chauvinist ideology of fascist rule, whether in Germany, Italy, Spain, Bulgaria or other countries. Fascist ideology and politics was and is a direct threat to all peoples, bound up with imperialist plans of expansion and domination — plans that could only be countered through the united struggle of all countries and peoples threatened by these regimes.
This anti-fascist struggle was an alliance of peoples, expressed in practical solidarity with the persecuted and in organised resistance. It included the rescue of those hunted by the regime and the support of resistance groups in cross-border anti-fascist work. Even in the countries of exile, this internationalism was alive: it created the conditions for the executive board of the SoPaDe to operate in Prague, the Central Committee of the KPD in Moscow, the 'German Cultural League' in London, and for German anti-fascists in exile to build 'Free Germany' committees and other political structures of anti-fascist action.
Anti-fascism as internationalism was most clearly visible in the fight to defend the Spanish Republic. Here internationalism took shape in the International Brigades, which — against the supposed non-intervention stance of the Western powers — offered practical solidarity with the threatened Republic. The strength of international solidarity managed to halt the fascist advance for several months. Many anti-fascists went to Spain knowing they were not only fighting Franco, but indirectly confronting the fascist threat in their own countries as well.
Internationalism was also alive in the concentration camps. Through the clandestine cooperation between German and foreign prisoners, collective survival was secured. In almost all the larger camps, conspiratorial international prisoner committees were formed. In Buchenwald concentration camp, an illegal International Military Organisation was even established, forming the basis for the self-liberation of prisoners on 11 April 1945. It was only fitting that the liberated prisoners of the camp, on 19 April 1945, swore a common oath — a legacy that remains binding for all survivors of Buchenwald, from whatever country they came.