Some say that George Herman Ruth (the Babe) belongs on this list as well . . . he also had an interesting nickname at St. Mary’s reformatory - “N***** Lips.
The other person from that era of Swiss and German heritage who was thought to have some black ancestry was J. Edgar Hoover; however this theory was disputed in the Washington Post:
Obviously there was a lot of racial hysteria due to the class divide as much as any other thing in the pre-Civil Rights era.