Courtesy of the Arkansas Delta Peace and Justice Center
On page 229 of James Dickerson's 1998 book Dixie's Dirty Secret the author quotes retired FBI agent Joe Sullivan as follows:
"We probably made a mistake of not making a more intensive probe of the Commission [Mississippi State Sovereignty Commission]; I think that was perhaps the key to a lot of the problems. I was aware they had money. I always suspected the White Knights were funded in some fashion by the Commission. In the years that followed, I wished we had done some probing in that area. We had nothing that would allow us to subpoena the documents."
Joe Sullivan was in charge of the FBI's effort to track down the killers of the three civil rights workers, James Chaney, Michael Schwerner, and Andrew Goodman.