29 CFR 458.92: Compliance with decisions and orders of the Administrative Review Board.

When remedial action is ordered, the respondent shall report to the Director, within a specified period, that the required remedial action has been effected. When the Director finds that the required remedial action has not been effected, he shall refer the matter for appropriate action to the Federal Labor Relations Authority (in the case of labor organizations covered by the CSRA), the Foreign Service Labor Relations Board (in the case of labor organizations covered by the FSA), or the Board of Directors of the Office of Compliance (in the case of labor organizations covered by the Congressional Accountability Act).