 Spengler was a conservative [[Authoritarianism|authoritarian]] popular during the [[interwar period]], though he had fallen out of favor with the Nazis because he had not wholly subscribed to their theories of racial purity.Lindbergh developed a long-term friendship with the automobile pioneer [[Henry Ford]], who was well known for his anti-Semitic newspaper "[[The Dearborn Independent]]".In a famous comment about Lindbergh to [[Detroit]]'s former FBI field office special agent in charge in July 1940, Ford said