Section, [Pub. L. 91–518, title VIII, § 801], Oct. 30, 1970, [84 Stat. 1339]; [Pub. L. 93–146, § 14], Nov. 3, 1973, [87 Stat. 554]; [Pub. L. 93–496, § 10], Oct. 28, 1974, [88 Stat. 1531]; [Pub. L. 94–555, title I, § 108], Oct. 19, 1976, [90 Stat. 2616], provided for promulgation and revision of regulations for adequacy of service and for maintenance of civil actions for enforcement of provisions.