- FC Union Berlin was formed in 1966, the result of a merger between two existing clubs, SC Union 06 Oberschöneweide and TSG Oberschöneweide. The union aimed at creating a stronger team capable of competing with top German clubs source.
In its early years, the club struggled to maintain consistency due to political interference in East Germany's sports structure. Despite these hurdles, Union Berlin managed some notable successes such as winning the FDGB-Pokal (East German Cup) in 1968 source.
Key figures during this period include Gerhard Graf who played over 250 games for the club between 1966 and 1979. Also worth mentioning is Heinz Werner who coached the team to cup success.