Until 1870, the crimes committed by the KKK and its members were violations of state and local, but not federal, law. Then, on March 30, 1870, the Fifteenth Amendment to the Constitution, which granted blacks the right to vote, was ratified after a long and bitter national debate. Equally important, it gave the federal government the power to protect that right with appropriate legislation. On May 31, 1870, the Enforcement Act was passed by Congress and signed by President Ulysses S. Grant. The law dealt mostly with the bribery and intimidation of voters, but it also made it a federal offense for two or more persons to conspire to deprive someone of any right of citizenship or to punish that person for exercising those rights.
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