south carolina v. katzenbach, 383 u.s. 301 (1966), is a united states supreme court case in which the court rejected a challenge from the state of south carolina to the preclearance provisions of the voting rights act of 1965, which required that some states submit changes in election districts to the attorney general of the united states (at the time, nicholas katzenbach). the preclearance provisions were ruled constitutional and the voting rights act of 1965 was enforced in full.