William Hoff, Jr., was a virulent racist, and a leader of the National Socialist Movement. According to his brother Sheldon, he was also part African American.
Around 1995, Sheldon uncovered a bombshell, a gem that could have destroyed Wild Bill's credibility with the Nazis - in the 1910 census, their father's family was listed as black. Sheldon eventually traced their black ancestry back to the 1600s.
When he told his brother about his find, Wild Bill brushed it off.
"He was in denial, but after that he never gave us any of his 'white is superior' stuff," Sheldon said. [Link]