In 1964, three New Yorkers went missing in Philadelphia, Mississippi trying register black people to vote.
The Feds suspected a murder but local police refused to investigate and the local population was less than assisting.
Black people refused to help for fear of retaliation and white people refused to help because they were either involved or knew people involved.
So, in order to force a break in the case, the FBI, ALLEGEDLY, called in a favor from one of its informants, a caporegime or capo from the Colombo crime Family in the New York Outfit of the Italian Mob named Gregory Scarpa.
Allegedly, Scarpa kidnapped a member of the local Klavern, Lawrence Byrd from his story. He then took him to a nearby military base and tortured him to produce a confession.
It is unknown whether or not this is true and the FBI has neither confirmed nor denied the accuracy of the account.
But what IS known is that Scarpa had a falling out with the FBI over his payment for his assistance in another Civil Rights murder, that of Vernon Dahmer in Hattiesburg in 1966.
This then caused the FBI to burn him as a Confidential Informant and to walk away from him.