Altaic languages
For example, it was argued by Niclas Wahlgren that Herman Lundborg encouraged that the posited Ural-Altaic or Turanian, language family, which seeks to relate Sami to the Mongolian language, was used to justify Swedish racism towards the Sami people in particular. (There are also strong, albeit areal not genetic, similarities between the Uralic and Altaic languages, which provide a more benign but nonetheless incorrect basis for this theory.)