; 5 U.S.C. App.) to enforce and administer the provisions of section 6(d) of the Fair Labor Standards Act of 1938 ( 29 U.S.C. 206(d) ), except that the Secretary of Labor, through the Office of Federal Contract Compliance Programs, may also enforce this provision with respect to Federal contractors, Federal subcontractors, and federally assisted construction contractors, within the jurisdiction of the Office of Federal Contract Compliance Programs under Executive Order No. 11246 ( 42 U.S.C. 2000e note