We used to call them Blockwart (block warden), and then the GDR took em over, just renamed them to Abschnittsbevollmächtigter, but also Hausbuchführer or just A

We used to call them Blockwart (block warden), and then the GDR took em over, just renamed them to Abschnittsbevollmächtigter, but also Hausbuchführer or just AKP (Auskunftsperson).