Alongside individual and state surveillance documents, protocols of tapped telephone conversations provide unique source material. These are in part extremely accurate recordings of telephone conversations between members of the East German opposition stretching back to the 1950s. Only summarized protocols of the conversations exist. A selection of the tapped telephone protocols from the 1980s focusing in particular on East Berlin regime opponents was released (“Get to the point!”) by two members of the Research Department of the BStU, Ilko-Sacha Kowalczuk and Arno Polzin.