 However, Orzech correctly surmised that the newspapers were just an excuse and that the mass executions were simply the first step in total extermination of Warsaw's Jews.The Bund refused Czerniaków's request.Orzech also wrote bulletins and proclamations to the residents of the ghetto not to trust the Germans and not to volunteer for supposed "labor in Germany" from the Umschlagplatz (which was in fact a collection point for deportation to the Treblinka extermination camp)

Most likely he was one of the organizers of the Antifascist Block (a group representing leftist Zionist and secular Jewish groups) and served as the Bund's representative at its conferences.