Kammala jumla mai zuwa: An haife shi a Bucharest, ya zauna a wani ɓangare na ƙuruciyarsa a gidan danginsa a Botoşani, inda, yana da shekaru 11, ya shaida na farko
1907 tawaye na manoma (wanda, kamar yadda ya yarda daga baya, ya ba da gudummawa ga ra'ayoyin hagu). Lokacin da yake saurayi, ya karanta littattafan anarchist na Rasha, yayin da yake karatu a Paris a lokacin Yaƙin Duniya na ɗaya, ya shiga cikin ƙungiyoyin anarchist. Yayinda yake tafiya ta Finland a 1917, Callimachi ya halarci taron jama'a wanda Vladimir Lenin ya yi jawabi, kuma sakamakon haka ya karɓi Bolshevism.