@DaveSchrader Random ideas for show:
1) Blood Feuds. Gjakmarra especially because codified but more likely easier the various American feuds.
2) Secret Societies and "fraternities." No, not the usual. But ones in Asia or Africa. Leopard Society, Wole, Obingo Fraternity, etc even some of the more modern white ones in ZA. And Asian the various history of Tongs, Triads, Yakuza, various color Dragon societies, Thuggee, etc.)
3) Yazids (sadly infamously recently due to ISIS, not the "god" but the terror group" and the whole peacock god and culture.
4) Druze (very secret, who knows?)