Title: Stranit͡sy proletarskoĭ solidarnosti
Subjects: German Prisoners and prisons, History, Prisoners of war, Protest movements, Russo-Polish War, 1919-1920, Soviet Union. Raboche-Krestʹi︠a︡nskai︠a︡ Krasnai︠a︡ Armii︠a︡
Places: Germany, Soviet Union
Time periods: 1918-1933, Allied intervention, 1918-1920