Viktoria Berlin U19

First foundation (1906–1945)

The name 1. FC Union Berlin was used by two football clubs that shared a common origin as FC Olympia Oberschöneweide, founded in 1906 in Oberschöneweide, which at that time was a suburb 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 has had a distinct working-class image, in contrast to other local clubs with more middle-class origins, such as Viktoria 89 Berlin, Blau-Weiß 90 Berlin, BSV 92 Berlin or Tennis Borussia Berlin.

In 1933, German football was reorganized under the Third Reich into 16 top-flight divisions known as Gauligen. Oberschöneweide became part of the Gauliga Berlin-Brandenburg, where they generally earned middling, unexceptional results. They were relegated in 1935 and returned to first division play in 1936 after only one season's absence. In 1940, the team finished first in Group B of the division and then defeated Blau-Weiß 90 (1–2, 3–0) to win the overall division title. That advanced the club to the national playoffs where they were put out by Rapid Wien in the opening group round (2–3, 1–3). Union resumed its place as an average side. They were relegated again in 1942 and played the final war-shortened Gauliga season in 1944–45.

Dissolution and split (1945–1961)

After World War II, occupying Allied authorities ordered the dissolution of all organizations in Germany, including sports and football associations. A new sport community called SG Oberschöneweide was formed in late 1945 and it played in the City League organized immediately after the war which had four regional departments. The team did not qualify to the newly created Oberliga Berlin (I) in 1946 after a poor season, but was promoted in 1947, won the division title right away and regained club status as SG Union Oberschöneweide during 1948–49.

The club finished the 1949–50 season in second place in Berlin and qualified to take part in the national final rounds. However, escalating Cold War tensions led Soviet authorities to refuse the team permission to travel to take part. Two Union teams then emerged as most players and coaches emigrated west to form Sport-Club Union 06 Berlin which took part in the scheduled playoff match in Kiel against Hamburger SV, losing 0–7.

The players remaining in the east carried on as SG Union Oberschöneweide while a number of players who had emigrated west to form SC organized a third side called Berliner Ballspiel-Club Südost. The western team was a strong side until the construction of the Berlin Wall in 1961, drawing huge crowds to matches in the Olympiastadion. The division of the city led to a change of fortunes for BBC Südost which plays today in the lower divisions before meagre crowds.

Restart as Union Berlin (1961–1990)

The eastern branch of the club went through a number of name changes: Union Oberschöneweide (1950), BSG Motor Oberschöneweide (1951), SC Motor Berlin (1955), TSC Oberschöneweide (1957), TSC Berlin (1963) – finally becoming the football club 1. FC Union Berlin in 1966.

1. FC Union Berlin was founded during the reorganization of East German football in December 1965 and January 1966, when ten dedicated football clubs were created. However, the football department of TSC Berlin was originally not taken into account. Only two clubs were planned for East Berlin, to be formed from the football departments of ASK Vorwärts Berlin and SC Dynamo Berlin. This was already contrary to the original plan, which had envisioned only one football club per district. And the football department of TSC Berlin was only playing in the second tier DDR-Liga at the time.

1. FC Union Berlin was founded on the initiative of the powerful Herbert Warnke. Herbert Warnke was the chairman of the state-controlled national trade union FDGB and a member of the SED Politburo. Another SED politician and Politburo member who pushed for the founding of 1. FC Union Berlin was the SED First Secretary in East Berlin Paul Verner. Both ASK Vorwärts Berlin and SC Dynamo Berlin were associated with the armed organs (German: Bewaffnete Organe der DDR). Warnke therefore argued for the creation of a third "civilian club" for the working people in East Berlin. He would become a passionate fan of 1. FC Union Berlin and a sponsoring member of the club.