No government of ours can be accused of unfairly spying on citizens in order to break up a civilian movement could it? Their couldn't have possibly been an official effort literally spy on citizen to subvert right to freedom of lawful assembly, free speech or voters rights? It did and it happened with impunity in Mississippi.
The 'Spies of Mississippi' is a documentary that examines the Mississippi Sovereignty Commission, an official commission whose sole objective was to segregation and white supremacy, used spies - white and black - to accomplish that purpose. It was effective until the Voting Rights Act of 1965 was signed.
"Spies of Mississippi" is another reason why we must be vigilant and be wary of phrases such as 'states rights', 'succession', they must always be clarified and viewed with suspicion. It's important to understand that this is what happens when federal oversight is lax or missing.