Professor John Eastman notes that Maxine Waters may in fact be violating the Ku Klux Klan Act of 1871. Here is a posrtion of the HISTORY CHANNEL article on this:
…After 1870, Republican state governments in the South turned to Congress for help, resulting in the passage of three Enforcement Acts, the strongest of which was the Ku Klux Klan Act of 1871.
For the first time, the Ku Klux Klan Act designated certain crimes committed by individuals as federal offenses, including conspiracies to deprive citizens of the right to hold office, serve on juries and enjoy the equal protection of the law. The act authorized the president to suspend the writ of habeas corpus and arrest accused individuals without charge, and to send federal forces to suppress Klan violence. This expansion of federal authority–which Ulysses S. Grant promptly used in 1871 to crush Klan activity in South Carolina and other areas of the South–outraged Democrats and even alarmed many Republicans. From the early 1870s onward, white supremacy gradually reasserted its hold on the South as support for Reconstruction waned; by the end of 1876, the entire South was under Democratic control once again….