Ombudsman

n. public official who investigates citizens' complaints against the government

An ombudsman (English plural: ombudsmans or ombudsmen) is an official, usually (but not always) appointed by the government or by parliament, who is charged with representing the interests of the public by investigating and addressing complaints reported by individual citizens. In some jurisdictions, the Ombudsman is referred to, at least officially, as the 'Parliamentary Commissioner' (e.g., the West Australian state Ombudsman). The word ombudsman and its specific meaning, Swedish in origin, have since been adopted in to English as well as other languages, and ombudsmen have been instituted by other governments and organizations such as the European Union.
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Noun
1. a government appointee who investigates complaints by private persons against the government
(hypernym) investigator

n. ombudsman, public official who investigates citizens' complaints against the government

n. ombudsman, public official who investigates citizens' complaints against the government