Ka cika wannan magana: Daga 1921 zuwa 1929, Reiss ya yi hidima a Yammacin Turai, musamman a Berlin da Vienna. A Berlin, baƙon gidan su ya haɗa da Karl Radek da, tsohuwar matar Fedor Raskolnikov (wani jami'in sojan ruwa wanda ya rubuta tarihin
Tawaye na Kronstadt). A Vienna, abokai sun haɗa da Yuriy Kotsiubynsky, Alexander Schlichter, Angelica Balabanov, Paul Ruegg, Ivan Zaporozhets, Alexander Lykov, da kuma Emil Maurer. A Amsterdam, Reiss da matarsa sun san Henriette Roland-Holst, Hildo Krop, Gimbiya Juliana ta Netherlands, "Farfesa Carvalho", "H. C. Pieck" (Henri Pieck), kuma mafi mahimmanci "Henricus" ko "Henryk Sneevliet" (Henk Sneevliet). A wannan lokacin, Richard Sorge ya kawo Hede Massing zuwa Reiss don horo.