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The General German Workers' Association (German: Allgemeiner Deutscher Arbeiter-Verein, ADAV) was a German political party founded on 23 May 1863 in Leipzig, Kingdom of Saxony by Ferdinand Lassalle. It was the first organized mass working-class party in European history. The ADAV was the first German Labour Party, formed in Prussia prior to the establishment of the German Empire. It was active in the German Confederation, which included the Austrian Empire.