Polish agents also gathered detailed information about the morale of German soldiers in the East. After uncovering a sample of the information the Poles had reported, Gestapo officials concluded that Polish intelligence activity represented a very serious danger to Germany. As late as 6 June 1944, Heinrich Müller—concerned about the leakage of information to the Allies—set up a special unit called Sonderkommando Jerzy that was meant to root out the Polish intelligence network in western and southwestern Europe.[38]