The organisation is commonly known as the Chetniks, although the name of the organisation was later changed to the Yugoslav Army in the Fatherland (JVUO, ЈВУО).[6] Founded as the first Yugoslav resistance movement, it was royalist and nationalist, as opposed to the other, Josip Broz Tito's Partisans who were communist. Initially, the two groups operated in parallel, but by late 1941 began fighting each other in the attempt to gain control of post-war Yugoslavia. Many Chetnik groups collaborated or established modus vivendi with the Axis powers.