The communications system that Eiss set up to have the documents smuggled was complex and not without danger. The unofficial postal service was conducted by non-Jewish residents of the occupied countries, people he referred to in his letters as "pure Aryans" , and the phraseology that was used was designed to pass muster with the censors while being understood by the intended recipients. An example of this can be seen in a letter that he wrote to Agudath Israel’s American branch at an early stage, before people were yet aware of the Nazis’ extermination efforts. It stated: ""Our friend Rav Alexander Susha Friedman wrote me a letter of thanks on behalf of Mr. Mekayem Nefesh"" and that ""Mr. Chalelei Raav (Dying of Hunger) is a permanent guest at our friends' homes.""