Adorno's intellectual nonconformism was also shaped by the repugnance he felt towards the nationalism which swept through the Reich during the First World War. Along with future collaborators Walter Benjamin, Max Horkheimer and Bloch, Adorno was profoundly disillusioned by the ease with which Germany's intellectual and spiritual leaders—among them Max Weber, Max Scheler, Georg Simmel, as well as his friend Siegfried Kracauer—came out in support of the war. The younger generation's distrust for traditional knowledge arose from the way in which this tradition had discredited itself. Over time, Oscar Wiesengrund's firm established close professional and personal ties with the factory of Karplus & Herzberger in Berlin. The eldest daughter of the Karplus family, Margarete, or Gretel, moved in the intellectual circles of Berlin, where she was acquainted with Benjamin, Bertolt Brecht and Bloch, each of whom Adorno would become familiar with during the mid-1920s; after fourteen years, Gretel Karplus and Adorno were married in 1937.