What did European governments know about CIA renditions, when did they know it, and how much did they participate?

The question is raised in my mind by a story about the Khaled El-Masri rendition, reported in the Spring 2006 issue of Civil Liberties, the official magazine of the ACLU.

El-Masri claims that he is "90 percent" certain a man who interrogated him three times in Afghanistan was a German. That and other details of the story have me wondering whether some German intelligence agency was participating more in renditions than the government knew, or maybe even if Gerhard Schroeder DID know and Berlin's official hands are a lot dirtier than it wants to say.

Update: We may soon have the answer, as Germany’s three opposition parties have forced the opening of a Reichstag investigation. The leading party in the current ruling coalition, the Christian Democratic Union/Christian Social Union, not pushing for the investigation doesn’t surprise me. But, that the Social Democrats, the party of former Chancellor (during the time of el Masri and other renditions) Gerhard Schroeder also not pushing for the investigation is a silence that speaks loudly.