In the case of any respondent who fails to request a hearing after receiving adequate notice of the allegations pursuant to § 5.57 or who is found in the Commission's final decision to have violated 18 U.S.C. 207 (a), (b), or (c), the Commission may order such disciplinary action as it deems warranted, including:

(a) Reprimand;

(b) Suspension from participating in a particular matter or matters before the Commission; or

(c) Prohibiting the respondent from making, with the intent to influence, any formal or informal appearance before, or any oral or written communication to, the Commission or its staff on any matter or business on behalf of any other person (except the United States) for a period not to exceed five (5) years.