This subsection shall apply to warehousemen, processors, and common carriers of corn, wheat, cotton, or rice, and ^[1] all ginners of cotton,^[2] all persons engaged in the business of purchasing corn, wheat, cotton, or rice from producers. Any such person shall, from time to time on request of the Secretary, report to the Secretary such information and keep such rec­ords as the Secretary finds to be necessary to enable him to carry out the provisions of this subchapter. Such information shall be reported and such records shall be kept in accordance with forms which the Secretary shall prescribe. For the purpose of ascertaining the correctness of any report made or record kept, or of obtaining information required to be furnished in any report, but not so furnished, the Secretary is authorized to examine such books, papers, rec­ords, accounts, correspondence, contracts, documents, and memoranda as he has reason to believe are relevant and are within the control of such person. Any such person failing to make any report or keep any record as required by this subsection or making any false report or record shall be deemed guilty of a misdemeanor and upon conviction thereof shall be subject to a fine of not more than $500.