Berliner FC Dynamo is a football club based in Berlin, Germany, with a deeply controversial history, currently playing in the Regionalliga Nordost, the fourth tier of German football. The club plays at the Sportforum Hohenschönhausen, a venue steeped in history. Founded in 1966, it was the club of the East German Ministry for State Security (Stasi) and, under its patronage, won ten consecutive East German championships from 1979 to 1988—a record often viewed as tainted by alleged referee bias. The club's name and identity remain symbols of that era. After reunification, the club was relegated down the pyramid and has never returned to the professional Bundesliga. The modern era sees BFC Dynamo as a strong regional side with a large and notoriously passionate, sometimes problematic, fanbase that maintains a strong sense of identity. They are perennial promotion contenders in the Regionalliga, dreaming of a return to the professional leagues. The club's matches are among the best-attended in the fourth tier. Berliner FC Dynamo is a club defined by its complex past and its enduring, turbulent presence in German football.