General German Trade Union Federation
The General German Trade Union Federation (German: Allgemeiner Deutscher Gewerkschaftsbund, ADGB) was a confederation of trade unions in Germany founded during the Weimar Republic. It was founded in 1919 and was initially powerful enough to organize a general strike in 1920 against a right-wing coup d'état.
Source: Wikipedia — General German Trade Union Federation (CC BY-SA 4.0)