Because when the topic of a "global elite," (particularly in finance and banking) is broached, that's exactly where the alt-right's beliefs go. To them, the terms are code for Jews, Zionists, non-whites, etc. Good example of "saying it with out really saying it":
http://honoranddaring.com/who-are-the-globalists/
"...Globalization destroys culture. Distinctive culture needs homogenous societies to develop in. Globalization increases diversity which throws cultures together into a hodge podge. The result is that the only common culture is consumerism..."
Historical perspective on "globalism":
https://www.google.com/amp/s/amp.theguardian.com/world/2015/sep/16/hitlers-world-may-not-be-so-far-away
"...By presenting Jews as an ecological flaw responsible for the disharmony of the planet, Hitler channelled and personalised the inevitable tensions of globalisation..."

Breitbart "goes there" frequently, with a few cosmetic tweaks to buffer the insanity. Many on the alt-right are avowed white nationalists; some actually envision a "White Empire" stretching across North America, Northern Europe and Russia.