Why is the KKK called the invisible empire?

The Ku Klux Klan (KKK) is referred to as the "Invisible Empire" due to its secretive nature and the use of intimidation and fear to exert control over communities, especially in the post-Civil War South. The term reflects the Klan's clandestine operations, where members often wore robes and masks to conceal their identities, creating a sense of anonymity. This secrecy allowed them to operate outside the law and maintain an atmosphere of terror while presenting themselves as a legitimate force for white supremacy and racial purity.