Anubis' queen

Anubis' Queen was a Goa'uld Queen who acted in collusion with the Goa'uld: Anubis, to spawn a new type of Goa'uld symbiotes which did not have the genetic memories of the Goa'uld. These "blank-slated symbiotes" would be used for Anubis' Kull Warriors, leaving them as non-intelligent slaves open for mind-imprinting at the hands of Anubis.

Because they lacked any inherent intelligence or thought patterns, the mind imprinting leaves the symbiote (and by extension, "Kull Warrior") completely loyal and incapable of disloyal thoughts.