The one which was tapping phone calls was completely separated from the one which controlled the letters, for good reasons, because if one agent quit the Stasi, his knowledge was very small.
Odjel koji je prisluškivao telefone bio je u potpunosti odvojen od onoga koji je kontrolirao pisma, i iz dobrih razloga, jer ako jedan agent  prestane biti Stasi, njegovo znanje je skromno.