The term ``party,'' whenever used in this part, includes any natural person, corporation, association, firm, partnership, trustee, receiver, agency, public or private organization, government agency, or unit thereof representing said agency. A party who files a complaint under Sec. 502.62 shall be designated as ``complainant.'' A party against whom relief or other affirmative action is sought in a proceeding commenced under Sec. 502.62 or Sec. 502.73 or a party named in an order of investigation issued by the Commission shall be designated as ``respondent,'' except that in investigations instituted under section 11(c) of the Shipping Act of 1984, 46 U.S.C. 41302(a)-(b), 41307(b), the parties to the agreement shall be designated as ``proponents'' and the parties protesting the agreement shall be designated as ``protestants.'' A person who has been permitted to intervene under Sec. 502.68 shall be designated as ``intervenor.'' All parties and persons designated in this section shall be parties to the proceeding. No person other than a party or its representative may introduce evidence or examine witnesses at hearings. [Rule 41]. [78 FR 45070, July 26, 2013]