If, after a license shall have been issued to an applicant, the Secretary believes that the license was obtained through a false or misleading statement in the application therefor or through a misrepresentation, concealment, or withholding of facts respecting any violation of this chapter by any officer, agent, or employee, he may, after thirty days’ notice and an opportunity for a hearing, revoke said license, whereupon no license shall be issued to said applicant or any applicant in which the person responsible for such false or misleading statement or misrepresentation, concealment, or withholding of facts is financially interested, except under the conditions set forth in section 499d(b) of this title.