Yeah, the Khazar theory I don't believe is rooted in anti-semitism. I don't know its origins, but it was popularized in a book by Koestler, more well known from his book "Darkness at Noon" (which I really liked). In the 70's he wrote a book called "The Thirteenth Tribe" about the Khazars, whose leader supposedly made his ?Turkic? tribe convert to Judaism to differentiate them from Christians and Muslims, but subsequent research seems to indicate that it is more myth than reality. Neo nazis have glommed on to it because they have a real need to believe all sorts of crap.