The Kochs
did literally aid and abet the Nazis:
https://www.nytimes.com/2016/01/12/us/politics/father-of-koc...
Along with a significant portion of other U.S. industry, including IBM, AT&T, Coca Cola, Ford, GM, and more.
This isn't the quality of reference I'd generally provide, but it's a quick find and seems generally accurate in the basics:
http://www.ranknfile-ue.org/uen_nastybiz.html
And:
https://listverse.com/2013/10/24/10-big-business-nazi-profit...
(Several of the listed companies are in fact German, which isn't surprising. There are several American firms as well, including Kodak and Standard Oil.)
Washington Post on Ford and GM:
https://www.washingtonpost.com/wp-srv/national/daily/nov98/n...
The IBM case is exceedingly well documented:
http://www.nytimes.com/books/first/b/black-ibm.html
Getting back to the Kochs and various Nazi, anti-semitic, and Holocaust-denial elements:
Reason Magazine, almost wholly backed by the Koch Brothers, ran a Holocaust-denial special issue, and doubled down on it when called out:
https://pando.com/2014/07/24/as-reasons-editor-defends-its-r...
Regnery Press, strongly associated with Chicago School economists (it published Milton Friedman, George Stigler, F.A. Hayek, and others), and long a standard of the conservative Right and Libertarian movements, is strongly associated with the alt-right:
Regnery has become major figure in the white nationalist movement, having founded the National Policy Institute, a white supremacist “think tank,” and the Charles Martel Society, which publishes The Occidental Quarterly, a racist, anti-Semitic and pseudo-scholarly “journal.”
https://www.splcenter.org/fighting-hate/extremist-files/indi...