Professional sports in Serbia are organised by sporting federations and leagues (in the case of team sports). One of the particularities of Serbian professional sports is the existence of many multi-sport clubs (called "sports societies"), the biggest and most successful of which are Red Star, Partizan, and Beograd in Belgrade; Vojvodina in Novi Sad; Radnički in Kragujevac; and Spartak in Subotica.