> often-documented regular raids from /other/ hunter-gather bands, including torture, rape, murder and slavery.

There is no slavery in migratory hunter-gatherer bands, I can't even conceive how that would function. Slavery arose with the agricultural revolution. This is not "oft-dicumented" or even documented

> internal tribal

A hunter-gatherer band is not in a tribe.

I am talking about migratory hunter-gatherer bands and you are talking about slave societies and then tribes.