Clubul Sportiv Muncitoresc Reșița (Romanian pronunciation: [ˌklubul sporˈtiv ˌmuŋtʃi.toˈresk ˈreʃit͡sa]), commonly known as CSM Reșița or simply as Reșița, is a Romanian football club based in Reșița, Caraș-Severin County, currently playing in the Liga III.
The club was founded on 25 May 1926 as UD (Uzinele și Domeniile) Reșița and throughout its almost centennial history survived to many sharp ups and downs, from a national title in 1931 and a silver medal in 1932 to the last shine in the late 1990s, several reorganizations in the 2000s and an almost fatal fall at the level of amateur leagues during the 2010s.
Over time CSM had important battles with local rivals as Muncitorul Reșița or Gloria Reșița, but has secured itself the city's supremacy, as well as the title of county's most important and supported club. Despite the strong support from the Mountain Banat, Reșițenii have never succeeded in imposing themselves on a regional level, not even the national title won in 1931 or the 1954 cup not being able to tilt the balance in favor of "the red and blacks", in their duel for Banat against FC Politehnica Timișoara. In time the rivalry between the two sides increased as intensity and continued even after the bankruptcy of FC Politehnica, but now at a much lower level, against ASU Politehnica Timișoara, fans team and unofficial successor of the old white and violet side.
CSM Reșița is nicknamed by fans Rosso-Nerii or Milan from Banat due to its classical red kits with black stripes. Reșița's supporters are well-known in Romania for the eagerness with which support their team, the ultras group of CSM being named Guardia Rosso-Nera (GRN). Rosso-Nerii play their home matches on Mircea Chivu Stadium.
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