A list of persons or firms found to be in violation of the Act is contained in the Excluded Parties List System (see 9.404). No Government contract may be awarded to any violator so listed because of a violation of the Act, or to any firm, corporation, partnership, or association in which the violator has a substantial interest, without the approval of the Secretary of Labor. This prohibition against award to an ineligible contractor applies to both prime and subcontracts.