Section, acts July 1, 1941, ch. 268, 55 Stat. 448; June 8, 1942, ch. 396, 56 Stat. 333; June 28, 1943, ch. 173, title I, 57 Stat. 222; June 26, 1944, ch. 277, title I, 58 Stat. 337; Dec. 20, 1944, ch. 617, § 2(a), 58 Stat. 832; June 13, 1945, ch. 189, 59 Stat. 241; July 1, 1946, ch. 530, 60 Stat. 390; Oct. 28, 1949, ch. 783, title I, § 101(c)(3), 63 Stat. 974; Oct. 24, 1951, ch. 554, § 2(c)(2), 65 Stat. 614; June 28, 1955, ch. 189, § 4(e)(3), 69 Stat. 177; May 19, 1956, ch. 313, Ch. XII, 70 Stat. 175; Sept. 1, 1959, Pub. L. 86–213, § 1(a), (b), 73 Stat. 443; Aug. 10, 1961, Pub. L. 87–130, 75 Stat. 323, authorized Senators and committee chairmen to change employees’ salaries, required certifications, and provided for designation of titles for positions. See section 4575(a), (d), (e) of this title.

Repeal effective Aug. 1, 1967, see section 105(k) of Pub. L. 90–57, set out as an Effective Date note under section 4575 of this title.