ms: Semasa Perang Dunia Pertama, beliau bekerja di Geneva, di mana beliau belajar dengan Willi Mnzenberg. Beliau bekerja di Geneva semasa Perang Dunia Pertama, di mana beliau belajar dengan Willi Mnzenberg.
en: During the First World War , he worked in Geneva , where he studied with Willi Münzenberg . He worked in Geneva during the First World War , where he studied with Willi Münzenberg .