Head Commissioner Labaume was something akin to the Fuhrer of the informers who were tasked with surveilling the milieus of the extreme Left; his position gave him the right to indulgence. It made for good hunting. To the five victims of his informer, Rastelli, condemned to death, he added Picant, Cadras, Politizer, and Jacques Solomon, as well as all those who were deported and perished slowly in the German camps.
I read the Quadruppani. He is obviously a disinformer and perhaps a 'type b' disinformer. At least on the borderline? That is to say, manipulated by his dangerous associations (police-related or repenters) and also by the person who wrote the preface.