When the Berlin Wall fell in November 1989 , Stasi agents were given the order to cover their tracks and destroy any evidence that would reveal names of secret informants , documentation of dealings with the West , protocols and recordings of trial proceedings -- none of it was ever meant to be seen by the public . Henning Frunder was arrested in East Germany after his refusal to leave came to attention of Stasi . When the Wall fell in 1989 , Stasi agents tried to find records which would reveal informants . A painstaking operation to piece together more than 600 ##0 pieces of paper continues . Hitler 's name , and the name of the man who betrayed him , were revealed .
Henning Frunder was arrested in East Germany after his refusal to leave came to attention of Stasi . When the Wall fell in 1989 , Stasi agents tried to find records which would reveal informants . A painstaking operation to piece together more than 600 ##0 pieces of paper continues . Hitler 's name , and the name of the man who betrayed him , were revealed .