29 C.F.R. § 500.40

Any person who desires to engage in any activity as a farm labor contractor, as defined in the Act and these regulations, and is not exempt, is required first to obtain a Certificate of Registration authorizing each such activity. Any employee of a registered farm labor contractor who performs farm labor contracting activities solely on behalf of such contractor, and who is not an independent contractor, must obtain a Farm Labor Contractor Employee Certificate of Registration authorizing each such activity. The employee's certificate must show the name of the farm labor contractor for whom the activities are to be performed. The contractor whose name appears on the employee's certificate must hold a valid Certificate of Registration covering the entire period shown on the employee's certificate.