Here's a whole *different* brand: There is a black supremacist group called the Black Hebrew Israelites, who think their brand of being G-d's chosen people is better than everybody else's... and will kill to make that point. I had _no idea_ such a thing existed until a friend popped up on don't-get-me-started-book and said they were safe despite living very close to the scene... I knew of outfits like Nation of Islam, but never anything ostensibly intra-tribal like this...

I don't know of a good place to start for Hispanic folk, but the first name that popped into my head when you mentioned the idea of better food for African-rooted folk was Michael Twitty...