リヒャルト・ゾルゲ
In the summer of 1922, he attended the Institute's "Erste Marxistische Arbeitswoche" (First Marxist Week) in Ilmenau, Thuringia. Among the participants at the week-long session were Georg Lukács, Karl Korsch, Richard Sorge, Friedrich Pollock, Karl August Wittfogel, Bela Fogarasi, Karl Schmuckle, and Konstantin Zetkin, the younger of the two sons of socialist leader and feminist Clara Zetkin.