This part prescribes rules with regard to persons who may practice before the Farm Credit Administration and the circumstances under which attorneys, accountants, appraisers, or other persons may be suspended or debarred, either temporarily or permanently, from practicing before the Farm Credit Administration. In connection with any particular matter, reference also should be made to any special requirements of procedure and practice that may be contained in the particular statute involved or the rules and forms adopted by the Farm Credit Administration thereunder, which special requirements are controlling. In addition to any suspension hereunder, a person may be excluded from further participation in a particular adjudicative proceeding in accordance with § 622.3 or in a formal investigation in accordance with § 622.105.