 The Voting Rights Act required states to make adjustments to their voting and registration systems if the state employed a literacy test and if the voter turnout or registration was less than fifty percent by November 1, 1964.This was known as the preclearance requirement and affected mostly southern states, making them seek approval from the U.S. District Court for any changes to their voter registration and voting system.In South Carolina, the state attorney general, Daniel R. McLeod filed a complaint directly with the Supreme Court attacking the constitutionality of the act and asking for an injunction against enforcement by the attorney general of the United States, Nicholas Katzenbach.