The laws passed in Congress to stop the Ku Klux Klan's violence had limited success for a number of reasons.
One reason is that the laws were difficult to enforce. The Ku Klux Klan operated in secret, often using disguises and masks to conceal their identity. This made it difficult for law enforcement to identify and prosecute Klan members for their crimes. Additionally, many local authorities were either sympathetic to the Klan or unwilling to take action against them, which further hindered the enforcement of the laws.
Another reason is that the laws did not address the root causes of the Klan's violence. The Klan was motivated by racism, white supremacy, and a desire to maintain the social and political status quo in the South. While the laws aimed to punish individual acts of violence, they did not address the underlying ideology that fueled the Klan's actions.
Finally, the laws were limited in scope and did not provide sufficient protection for African Americans. While the laws aimed to protect all citizens from violence and intimidation, they were not always effective at doing so. Many African Americans were still subjected to violence and discrimination, even after the laws were passed.
Overall, the laws passed in Congress to stop the Ku Klux Klan's violence had limited success due to a combination of enforcement challenges, a lack of addressing root causes, and insufficient protection for African Americans.