Any person who engages in the practice of professional gambling on greyhound dog races, or in the practice of making gambling or wagering books on such races, or who knowingly takes any part in such practices, or has been convicted of any charge of gambling, any felony, or any crime involving moral turpitude shall not be eligible as an applicant for any license or permit to operate a race track or a race meeting under this part. Any association, partnership, or corporation or related association, partnership, or corporation thereof, which has or has had within 10 years such a person as an officer, executive, stockholder, or director or who does or has within the past 10-year period knowingly employed any person who engages in such practices shall likewise be ineligible as a licensee and the racing commission is hereby empowered to inquire into such matters in considering any applications and otherwise administering this part.