After the expiration of thirty days after the Secretary has given public notice that any stockyard is within the definition of section 202 of this title, by posting copies of such notice in the stockyard, no person shall carry on the business of a market agency or dealer at such stockyard unless (1) the stockyard owner has determined that his services will be beneficial to the business and welfare of said stockyard, its patrons, and customers, which determination shall be made on a basis which is not unreasonable or unjustly discriminatory, and has given written authorization to such person, and (2) he has registered with the Secretary, under such rules and regulations as the Secretary may prescribe, his name and address, the character of business in which he is engaged, and the kinds of stockyards services, if any, which he furnishes at such stockyard. Every other person operating as a market agency or dealer as defined in section 201 of this title may be required to register in such manner as the Secretary may prescribe. Whoever violates the provisions of this section shall be liable to a penalty of not more than $500 for each such offense and not more than $25 for each day it continues, which shall accrue to the United States and may be recovered in a civil action brought by the United States.

On and after July 12, 1943, the Secretary may require reasonable bonds from every market agency (as defined in this subchapter), every packer (as defined in subchapter II of this chapter) in connection with its livestock purchasing operations (except that those packers whose average annual purchases do not exceed $500,000 will be exempt from the provisions of this paragraph), and every other person operating as a dealer (as defined in this subchapter) under such rules and regulations as he may prescribe, to secure the performance of their obligations, and whenever, after due notice and hearing, the Secretary finds any registrant is insolvent or has violated any provisions of this chapter he may issue an order suspending such registrant for a reasonable specified period. Such order of suspension shall take effect within not less than five days, unless suspended or modified or set aside by the Secretary or a court of competent jurisdiction. If the Secretary finds any packer is insolvent, he may after notice and hearing issue an order under the provisions of section 193 of this title requiring such packer to cease and desist from purchasing livestock while insolvent, or while insolvent purchasing livestock except under such conditions as the Secretary may prescribe to effectuate the purposes of this chapter.

All stockyard services furnished pursuant to reasonable request made to a stockyard owner or market agency at such stockyard shall be reasonable and nondiscriminatory and stockyard services which are furnished shall not be refused on any basis that is unreasonable or unjustly discriminatory: Provided, That in any State where the weighing of livestock at a stockyard is conducted by a duly authorized department or agency of the State, the Secretary, upon application of such department or agency, may register it as a market agency for the weighing of livestock received in such stockyard, and upon such registration such department or agency and the members thereof shall be amenable to all the requirements of this chapter, and upon failure of such department or agency or the members thereof to comply with the orders of the Secretary under this chapter he is authorized to revoke the registration of such department or agency and to enforce such revocation as provided in section 216 of this title.

All rates or charges made for any stockyard services furnished at a stockyard by a stockyard owner or market agency shall be just, reasonable, and nondiscriminatory, and any unjust, unreasonable, or discriminatory rate or charge is prohibited and declared to be unlawful: Provided, That rates and charges based upon percentages of the gross sales prices of livestock shall not be prohibited merely because they are based upon such percentages rather than on a per head basis.

Whenever in any investigation under the provisions of this subchapter, or in any investigation instituted by petition of the stockyard owner, market agency, or dealer concerned, which petition is authorized to be filed, the Secretary after full hearing finds that any rate, charge, regulation, or practice of any stockyard owner, market agency, or dealer, for or in connection with the buying or selling on a commission basis or otherwise, receiving, marketing, feeding, holding, delivery, shipment, weighing, or handling, not in commerce, of livestock, causes any undue or unreasonable advantage, prejudice, or preference as between persons or localities in intrastate commerce in livestock on the one hand and interstate or foreign commerce in livestock on the other hand, or any undue, unjust, or unreasonable discrimination against interstate or foreign commerce in livestock, which is hereby forbidden and declared to be unlawful, the Secretary shall prescribe the rate, charge, regulation, or practice thereafter to be observed, in such manner as, in his judgment, will remove such advantage, preference, or discrimination. Such rates, charges, regulations, or practices shall be observed while in effect by the stockyard owners, market agencies, or dealers parties to such proceeding affected thereby, the law of any State or the decision or order of any State authority to the contrary notwithstanding.

If any stockyard owner, market agency, or dealer fails to obey any order of the Secretary other than for the payment of money while the same is in effect, the Secretary, or any party injured thereby, or the United States by its Attorney General, may apply to the district court for the district in which such person has his principal place of business for the enforcement of such order. If after hearing the court determines that the order was lawfully made and duly served and that such person is in disobedience of the same, the court shall enforce obedience to such order by a writ of injunction or other proper process, mandatory or otherwise, to restrain such person, his officers, agents, or representatives from further disobedience of such order or to enjoin upon him or them obedience to the same.

For the purposes of this subchapter, the provisions of all laws relating to the suspending or restraining the enforcement, operation, or execution of, or the setting aside in whole or in part the orders of the Interstate Commerce Commission, are made applicable to the jurisdiction, powers, and duties of the Secretary in enforcing the provisions of this subchapter, and to any person subject to the provisions of this subchapter.