Anecdote: I was at the tribal casino north of topeka back when it was harrah's with a big group and one of the girls' dads was there. He and I were playing blackjack and at one point he said something like "hit me, chief." I'm confident that "chief" was interchangeable at that moment with "boss," "bro," "bud," etc. at that moment but he said "chief" and the dealer was native. I was focused on the cards but it must've been a thing because his daughter who was standing behind us later told me she thought it was awful based on the dealer's reaction.
So yeah, change it to the kansas city bosses, until enough fans do offensive italian mafia dress-ups that they force another change.