 That month he wrote in a letter to "Comrade" , then in Konstanz, describing Margarethe's illness which he believed would be cured by plenty of rest and good food.In Berlin he worked as a trade representative for the Soviet Union, also participating in the film production unit of the Soviet sponsored Workers' International Relief ("IAH – Internationale Arbeiter-Hilfe / Международная рабочая помощь") organisation in Berlin.In 1931 he became a member of the "Arplan".