The Enforcement Act of 1870, also known as the Civil Rights Act of 1870 or First Ku Klux Klan Act, or Force Act was a United States federal law written to empower the President with the legal authority to enforce the first section of the Fifteenth Amendment throughout the United States. The act was the first of three Enforcement Acts passed by the United States Congress from 1870 to 1871 during the Reconstruction Era to combat attacks on the suffrage rights of African Americans from state officials or violent groups like the Ku Klux Klan.