 She left her child in the care of a French family following the start of German occupation, and joined the Paris-based "Francs-Tireurs et Partisans de la Main d'Oeuvre Immigrée" (FTP-MOI), taking part in about 100 sabotage acts against the Wehrmacht, and being personally involved in the manufacture and transport of explosives.This came at a time when the PCR, weakened by successive crackdowns, had become divided into several autonomous groups.Similar to Gheorghe Gaston Marin, Bancic was among the Romanian activists who were integrated into the French Communist Party.