1. FC Union Berlin is a professional football club based in the Köpenick district of Berlin, Germany, competing in the top-flight Bundesliga. The club, known as "Die Eisernen" (The Iron Ones), plays its home matches at the historic Stadion An der Alten Försterei. Founded in 1966, the club's identity is deeply rooted in its working-class community and its distinctive club culture, with fans famously participating in an annual stadium renovation workday. Union Berlin's colors are red and white. After decades in the lower divisions, their modern rise has been remarkable, achieving promotion to the Bundesliga for the first time in 2019. Under coaches like Urs Fischer, they have established themselves as a tough, defensively organized side, known for a passionate home atmosphere that is among the most intense in Germany. Recent seasons have seen them compete in European competitions, a testament to their incredible journey from the depths of German football to the top tier. The club is a symbol of resilience and fan power in modern football.