Günter Wallraff is a German writer and jounalist with a long time record of fighting for the suppressed. To give you just two examples:
He chained himself to a lamppost at a large central place in Athens during the military dictatorship as a protest against the general and was beaten and tortured before they found out his identity (he had no identification with him on purpose and he is fairly dark skinned) and sentenced him to 14 months.
He has posed as a Turkish worker in Germany to find out first hand how these workers are treated.

Now to Rushdie. In the first couple of days after the fatwa, Rushdie was hiding in Wallraff's home and they consider themselves friends since.

Wallraff has now proposed to read from the Satanic Verses in a mosque in Cologne and to discuss with those attending the reading (Wallraff has never shirked from any personal danger). One Muslim organisation in Cologne has responded with initial openness. I don't believe the reading will happen but would be delighted to be proved wrong. I can imagine Zawahiri's reaction if the reading should take place.

Wolfgang