I have also read that the Iroquois had a particularly fierce and mean streak, that they conquered, enslaved and destroyed the Huron and drove the Chippewa west. They instilled terror in other tribes.
They supposedly would rip the flesh off a captive piece by piece, in an attempt to induce fear of pain and death. They would hope to enslave these captives souls in the after life.
Very unlike the Navajo or Hopi.
I know they virtually wiped out the Huron, but I didn’t think they had any slaves.