The Comptroller General is authorized and directed to distribute a list to all agencies of the United States containing the names of persons or firms found by the Secretary of Labor to have breached any of the agreements or representations required by sections 35 to 45 of this title. Unless the Secretary of Labor otherwise recommends no contracts shall be awarded to such persons or firms or to any firm, corporation, partnership, or association in which such persons or firms have a controlling interest until three years have elapsed from the date the Secretary of Labor determines such breach to have occurred