The Board of Estimates shall establish and maintain a monthly list of all persons found in contempt of court by a federal court of appeals for failure to correct an unfair labor practice prohibited by the National Labor Relations Act (29 U.S.C. § 158, 49 Stat. 452). This list shall contain the names of those persons found to have engaged in these practices during the 2-year period before the date of the list. The Board will consider any company whose name appears on this list to have violated this ordinance and shall upon a formal charge and hearing of the facts, inform that company of its inadmission to the procedure for awarding of public works, services, or supply contracts or subcontracts. Nor shall any contract or subcontract be let to a bidder whose bid includes supplies from the adjudged violator. This restriction does not prohibit the awarding of a contract to a company whose name does not appear on such a list but whose goods manufactured include component parts manufactured by a company whose name does appear on the list. This restriction does not apply during an emergency situation when the listed person is the sole source of supply for the goods or services. City Code, 1976/83, art. 1, §17A Ord. 79-1165