In 1875 , the German socialist party ( SPD ) was founded in Gotha through the merger of two organizations : the Social Democratic Workers ' Party , led by August Bebel and Wilhelm Liebknecht , and the General German Workers ' Association , founded by Ferdinand Lassalle .
Gotha has played an important role in the Germany 's workers ' movement : the German socialist party ( SPD ) was founded in Gotha in 1875 , when the Social Democratic Workers ' Party , led by August Bebel and Wilhelm Liebknecht , and the General German Workers ' Association , founded by Ferdinand Lassalle joined together .