You might be referring to the works of Madison Grant where he split whites into three groups: Nordics, Alpines and Mediterranean. The Nordics are seen as the mo

You might be referring to the works of Madison Grant where he split whites into three groups: Nordics, Alpines and Mediterranean. The Nordics are seen as the most white, Alpines as less white and Mediterraneans even less white. In this case Slavic people are in the Alpine class. If you look at Viking migration by DNA, you can find 1:1 match with Grant's Nordic peoples areas in Europe.