Mezue ahịrịokwu na-esonụ: Site na 1921 ruo 1929, Reiss jere ozi n'Ebe Ọdịda Anyanwụ Europe, karịsịa Berlin na Vienna. Na Berlin, ndị ọbịa ụlọ ha gụnyere Karl Radek na, bụbu nwunye Fedor Raskolnikov (Onye isi ndị agha mmiri nke dere akụkọ ndụ ndị agha ahụ)
Nnupụisi nke Kronstadt). Na Vienna, ndị enyi m gụnyere Yuriy Kotsiubynsky, Alexander Schlichter, Angelica Balabanov, Paul Ruegg, Ivan Zaporozhets, Alexander Lykov, na Emil Maurer. Na Amsterdam, Reiss na nwunye ya maara Henriette Roland-Holst, Hildo Krop, Princess Juliana nke Netherlands, "Professor Carvalho", "H. C. Pieck" (Henri Pieck), na nke kachasị mkpa "Henricus" ma ọ bụ "Henryk Sneevliet" (Henk Sneevliet). N'otu oge a, Richard Sorge kpọtara Hede Massing na Reiss maka ọzụzụ.