ombudsman

noun ombudsmen

1. An appointed official whose duty is to investigate complaints, generally on behalf of individuals such as consumers or taxpayers, against institutions such as companies and government departments. "All the Nordic ombudsmen have the same view: that circumcision of boys should not be done until the boy is old enough to decide himself if is something he wants to do,” Anne Lindboe, Norway's Ombudsman for Children, told DW.
2. A designated internal mediator in an organization whose duty is to assist members with conflict resolution and other problems and to serve as an independent consultant to recommend changes to policies or procedures to improve organization effectiveness, efficiency, and humaneness.