Kammala jumla mai zuwa: Ya shiga cikin Tashin Silesian na Uku da kuma Yakin Poland-Soviet. Dubois ya kasance mai kirkirar "Red Scouts" ("Czerwone Harcerstwo Towarzystwa Uniwersytetu Robotniczego"). A cikin shekarun 1928-1933 ya kasance memba na majalisar Sejm ta Poland, kuma mai ba da shawara a Warsaw daga 1938. Dubois ya kasance sakatare a cikin editan ofishin jaridar "Robotnik" (Ma'aikaci). A matsayinsa na mai adawa da Sanation an tuhume shi a 1930 tare da tarzomar kwaminisanci a Lwów kuma an yanke masa hukunci a cikin
An yanke wa Brest hukuncin shekaru 3 a gidan yari. An tsare shi a Brest Fortress kuma yayin da yake kurkuku, ya gudu a zaben 'yan majalisa na Poland na 1930. An sake shi a wata mai zuwa.