The Mississippi Sovereignty Commission was a secret state police force operating from 1956 to 1977 to suppress the civil rights movement and maintain segregation. The commission kept files, harassed and branded many as communist infiltrators via agents who were retired FBI, CIA and military intelligence. No one was safe in Mississsippi. A form of the Sovereignty Commission continues today in Mississippi. Ask Haley Barbour.
Sovereignty Commission Online 65-page document describing Mississippi's fight (CCFAF) against the 1964 Civil Rights Act. Shows heavy involvement of (drum roll...) William Loeb of New Hampshire and James Kilpatrick of Virginia.