1. FC Union Berlin is a professional German association football club based in Berlin. The club emerged under the current name in 1966 but can be traced back to 1906, when predecessor FC Olympia Oberschöneweide was founded. They have competed in the 2. Bundesliga for seven consecutive seasons.The home ground Stadion An der Alten Försterei (Stadium by the old forester's house) is the largest single-purpose football stadium in the German capital. It has been home to Union Berlin and its forerunners since it was opened in 1920. The stadium became internationally famous for concerts and events like the annual Weihnachtssingen (Christmas Carols Event) and the WM-Wohnzimmer (World Cup Living Room) in 2014.The club is well known for its enthusiastic and creative fan base and for its chant "Eisern Union" (Iron Union).HistoryFirst foundation (1906–1945)The name 1. FC Union Berlin was used by two football clubs that shared a common origin as FC Olympia 06 Oberschöneweide, founded in 1906 in the Oberschöneweide district of Berlin. The side took on the name SC Union 06 Oberschöneweide in 1910. Union was one of Berlin's premier clubs in the interwar period, regularly winning local championships and competing at the national level, including an appearance in the 1923 German championship final which they lost 0–3 to Hamburger SV.Early on the team was nicknamed "Schlosserjungs" (English: metalworker-boys), because of their then all blue kit, reminiscent of the typical work clothing worn in the factories of the industrial Oberschöneweide district. The popular cry of Union-supporters – "Eisern Union!" (Iron Union) – also emerged at this time. Since its foundation the club had a clearly working-class image in contrast to other local clubs with middle-class origins, such as Viktoria 89 Berlin, Blau-Weiß 90 Berlin, BSV 92 Berlin or Tennis Borussia Berlin.
