The final documents detailing Chetnik ideology were produced by the Ba Congress called by Mihailović in January 1944, in response to the November 1943 Second Session of the communist-led Anti-Fascist Council for the National Liberation of Yugoslavia (, AVNOJ) of the Partisans. The Second Session of AVNOJ had resolved that post-war Yugoslavia would be a federal republic based on six equal constituent republics, asserted that it was the sole legitimate government of Yugoslavia, and denied the right of the King to return from exile before a popular referendum to determine the future of his rule. The month after the Second Session of AVNOJ, the major Allied powers met at Tehran and decided to provide their exclusive support to the Partisans and withdraw support from the Chetniks. The congress was held in circumstances where large parts of the Chetnik movement had been progressively drawn into collaboration with the occupying forces and their helpers over the course of the war, and may have been held with the tacit approval of the Germans.