The Equal Employment Opportunity Commission is hereinafter referred to as the Commission. The terms person, employer, employment agency, labor organization, and employee shall have the meanings set forth in section 11 of the Age Discrimination in Employment Act of 1967, as amended, 29 U.S.C. 621 et seq., hereinafter referred to as the Act. References to employers in this part state principles that are applicable not only to employers but also to labor organizations and to employment agencies.