After World War II the club was temporarily banned, and then re-established as SG Oberschöneweide. Located in the eastern part of Berlin, the club suffered badly from the division of the city. Due to Soviet authorities imposing a travel ban on the club, most players and coaches left for West Berlin in 1950 to form SC Union 06 Berlin. The remaining part carried on as SG Union Oberschöneweide, which was the name of the club since 1948. Following a series of name changes and mergers, the club was re-founded as football club 1. FC Union Berlin in 1966. Despite some early mild success in post-split Germany, Union were relatively unsuccessful in East Germany, frequently changing between 1st and 2nd division. They won the east German cup in 1968.