Wallraff has been heavily criticised by those on the receiving end of his style of investigation, via attempts to frame his work as breaching privacy rights or revealing trade secrets.
Attempts were made on a number of occasions to legally prevent Wallraff's investigative methods, but his actions were regularly ruled constitutional by the courts.
The courts opined that freedom of the press and public interest in areas concerned with the formation of public opinion favoured Wallraff's actions.
In balancing public interest with the competing interests of those immediately affected by his actions it follows however that private conversations, for example, may not be published.

In September 2003, investigations were made by the Stasi Records Agency into the Rosenholz files on Stasi workers which somehow got into the hands of the CIA; as a result, it was claimed that Wallraff had had connections to the Stasi in the 1960s.
Wallraff disputes that he ever actively worked for them.
On 17 December 2004, the Hamburg district court ruled on a suit brought by Wallraff that he must not be described as an Inoffizieller Mitarbeiter or Stasi collaborator (he was being called this above all in newspapers belonging to the Axel Springer Verlag, the publishers of Bild) as no proof of collaboration could be furnished in the documents which had been presented.
Wallraff has been heavily criticised by those on the receiving end of his style of investigation, via attempts to frame his work as breaching privacy rights or revealing trade secrets. Attempts were made on a number of occasions to legally prevent Wallraff's investigative methods, but his actions were regularly ruled constitutional by the courts. The courts opined that freedom of the press and public interest in areas concerned with the formation of public opinion favoured Wallraff's actions. In balancing public interest with the competing interests of those immediately affected by his actions it follows however that private conversations, for example, may not be published.
In September 2003, investigations were made by the Stasi Records Agency into the Rosenholz files on Stasi workers which somehow got into the hands of the CIA; as a result, it was claimed that Wallraff had had connections to the Stasi in the 1960s. Wallraff disputes that he ever actively worked for them. On 17 December 2004, the Hamburg district court ruled on a suit brought by Wallraff that he must not be described as an Inoffizieller Mitarbeiter or Stasi collaborator (he was being called this above all in newspapers belonging to the Axel Springer Verlag, the publishers of Bild) as no proof of collaboration could be furnished in the documents which had been presented.
Günter Wallraff