((a)) Whoever, being an officer or employee of the United States in the executive, legislative, or judicial branch of the Government or in any agency of the United States, other than in the proper discharge of his official duties—
((1)) acts as agent or attorney for prosecuting any claim against the United States, or receives any gratuity, or any share of or interest in any such claim, in consideration of assistance in the prosecution of such claim; or
((2)) acts as agent or attorney for anyone before any department, agency, court, court-martial, officer, or civil, military, or naval commission in connection with any covered matter in which the United States is a party or has a direct and substantial interest;
((b)) Whoever, being an officer or employee of the District of Columbia or an officer or employee of the Office of the United States Attorney for the District of Columbia, otherwise than in the proper discharge of official duties—
((1)) acts as agent or attorney for prosecuting any claim against the District of Columbia, or receives any gratuity, or any share of or interest in any such claim in consideration of assistance in the prosecution of such claim; or
((2)) acts as agent or attorney for anyone before any department, agency, court, officer, or commission in connection with any covered matter in which the District of Columbia is a party or has a direct and substantial interest;
((c)) A special Government employee shall be subject to subsections (a) and (b) only in relation to a covered matter involving a specific party or parties—
((1)) in which he has at any time participated personally and substantially as a Government employee or special Government employee through decision, approval, disapproval, recommendation, the rendering of advice, investigation, or otherwise; or
((2)) which is pending in the department or agency of the Government in which he is serving.
((d))
((1)) Nothing in subsection (a) or (b) prevents an officer or employee, if not inconsistent with the faithful performance of that officer’s or employee’s duties, from acting without compensation as agent or attorney for, or otherwise representing—
((A)) any person who is the subject of disciplinary, loyalty, or other personnel administration proceedings in connection with those proceedings; or
((B)) except as provided in paragraph (2), any cooperative, voluntary, professional, recreational, or similar organization or group not established or operated for profit, if a majority of the organization’s or group’s members are current officers or employees of the United States or of the District of Columbia, or their spouses or dependent children.
((2)) Paragraph (1)(B) does not apply with respect to a covered matter that—
((A)) is a claim under subsection (a)(1) or (b)(1);
((B)) is a judicial or administrative proceeding where the organization or group is a party; or
((C)) involves a grant, contract, or other agreement (including a request for any such grant, contract, or agreement) providing for the disbursement of Federal funds to the organization or group.
((e)) Nothing in subsection (a) or (b) prevents an officer or employee, including a special Government employee, from acting, with or without compensation, as agent or attorney for, or otherwise representing, his parents, spouse, child, or any person for whom, or for any estate for which, he is serving as guardian, executor, administrator, trustee, or other personal fiduciary except—
((1)) in those matters in which he has participated personally and substantially as a Government employee or special Government employee through decision, approval, disapproval, recommendation, the rendering of advice, investigation, or otherwise, or
((2)) in those matters which are the subject of his official responsibility,
((f)) Nothing in subsection (a) or (b) prevents a special Government employee from acting as agent or attorney for another person in the performance of work under a grant by, or a contract with or for the benefit of, the United States if the head of the department or agency concerned with the grant or contract certifies in writing that the national interest so requires and publishes such certification in the Federal Register.
((g)) Nothing in this section prevents an officer or employee from giving testimony under oath or from making statements required to be made under penalty for perjury or contempt.
((h)) For the purpose of this section, the term “covered matter” means any judicial or other proceeding, application, request for a ruling or other determination, contract, claim, controversy, investigation, charge, accusation, arrest, or other particular matter.
((i)) Nothing in this section prevents an employee from acting pursuant to—
((1)) chapter 71 of title 5;
((2)) section 1004 or chapter 12 of title 39;
((3)) section 3 of the Tennessee Valley Authority Act of 1933 ();
((4)) chapter 10 of title I of the Foreign Service Act of 1980 ( et seq.); or
((5)) any provision of any other Federal or District of Columbia law that authorizes labor-management relations between an agency or instrumentality of the United States or the District of Columbia and any labor organization that represents its employees.