I just learned from a German newssite that a man who calls himself "Ryan Davis" was working undercover in the German neo-Nazi scene, then went rogue and founded the German arm of the Ku-Klux-Clan. The officials only found out about this by accident. In 2003 he left the Ku-Klux-Clan and became chief witness telling the police all about the organisation.
If you know german you can read up on this: http://www.sueddeutsche.de/politik/ku-klux-klan-und-verfassungsschutz-doppeltes-spiel-im-kapuzen-kostuem-1.1592532-2
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