Thank you! I don’t know if the author of the book identifies with the Black Hebrew Israelite (BHI) movement, but people following this article may benefit from knowing about it. Basically it’s an extremely tiny fringe antisemitic group that believes modern-day Jews are fake Jews. The Southern Poverty Law Center has identified them as a hate group, and the KKK has called it “the black counterparts of us.” Learn more: https://en.wikipedia.org/wiki/Black_Hebrew_Israelites
I want to emphasize that I vehemently oppose any effort to paint Black people in general as antisemitic. I’m only talking about a very small hate group.