An intervenor is a a party who does not have a substantial and direct interest but has clearly ascertainable interests and perspectives essential to a judicial determination and whose standing has been granted by the court for all or a portion of the proceedings.
The following is an example of a state statute dealing with intevenors:
" Sec. 4-61dd-10. Parties and intervenors
(a) The complainant and the respondent shall be parties. Other persons may petition the presiding officer to participate as parties or intervenors. The presiding officer may grant party or intervenor status to any person meeting the standards of section 4-177a of the Connecticut General Statutes, and may limit an intervenor's participation as provided therein. Once granted such status, a party or intervenor, subject to any limitations imposed by the presiding officer, shall be treated like any other party to the proceedings, with the same rights and obligations attendant thereto.
(b) Any party may object to the participation of another person as a party or intervenor by filing, at or before the commencement of a hearing, a written objection and serving a copy of the objection upon the person seeking such status and upon all other parties of record in accordance with section 4-61dd-5(c) of the Regulations of Connecticut State Agencies and section 4-177a of the Connecticut General Statutes."