five and SK Jugoslavija two. The interruption of the championship occurred due to disagreements between the sub-associations, which culminated in 1929 when the YFA Assembly was dissolved. The differences were resolved in February 1930, after three months of crisis. An extraordinary Assembly was convened, and it took place in Zagreb on 16 May 1930. It was voted that the association's headquarters be moved to the state capital, Belgrade, and that the name of the association would be changed into Yugoslav Football Association (Fudbalski savez Jugoslavije). BSK, along with HŠK Građanski, dominated the state scene until the beginning of World War II. This period was marked by the mass popularization of football. The national league was dominated by clubs from Belgrade and Zagreb, but within Belgrade major rivalry was created between BSK and Jugoslavija (Reds and Blues respectively) creating what will be the Eternal derby of that period. The rivalry expanded throughout the country, more intensely in Serb populated areas but in others as well, dividing citizens between Reds and Blues. Best league players became real media stars, and some became real heartbreakers among the female population, as was Bane Sekulić. The year of 1935 marked the professionalization of football in Yugoslavia, with the replacement of amateur status to the professional one, and the introduction of contracts for players. On the assembly of the Yugoslav Football Association held on October 1, 1939, a decision was made to rename the FA into Serbian Football Association, after earlier that year the FA's of Croatia and Slovenia were formed, and the delegates of Ljubljana, Osijek, Split and Zagreb subassociations decided to abandon the Yugoslav Football Association. Socialist Yugoslavia The end of the war was the beginning of the reconstruction, and the devastated football grounds and stadiums, as well as the football clubs needed to be restored. On 25 February 1945, the football club Metalac was founded, later its name was changed into BSK, and then into OFK Beograd, as successor to the tradition of the pre-war Beogradski Sport Klub (BSK). The Red Star Belgrade was formed on 4 March 1945, and Partizan Belgrade on 4 October of the same year. Some clubs were disbanded by the new socialist authorities, many on the ideological basis, for being considered too cosmopolitan and representative of the abolished monarchy, such as Jugoslavija or Jedinstvo Beograd, and some had simply disappeared due to man loss and long inactivity during