Prior section 4111, Pub. L. 85–857, Sept. 2, 1958, 72 Stat. 1247; Pub. L. 87–793, § 804, Oct. 11, 1962, 76 Stat. 861; Pub. L. 89–785, title I, § 108, Nov. 7, 1966, 80 Stat. 1370; Pub. L. 98–160, title II, § 206, Nov. 21, 1983, 97 Stat. 1001, related to appointment of additional employees, prior to repeal by Pub. L. 102–40, title IV, § 401(a)(3), May 7, 1991, 105 Stat. 210. See section 7408 of this title.