Due to the Ashkenazi "superiority" in terms of IQ when compared to gentile whites, white supremacists would not have struck me too as an obvious first guess.
This was a survey of ancestry/genetic structure. Not trait values. Here is the post, just page down to the image and you can see why they were interested:
http://scienceblogs.com/gnxp/2009/01/how_ashkenazi_jewish_are_you.php
Link.
"Razib Khan has an academic background in the biological sciences, and has worked for many years in software. He is an Unz Foundation Junior Fellow. He lives in the western United States."
Razib's writings can be found on his blog, Gene Expression.