Judicial Watch wants the case file assembled for the murder of Cardillo, who was shot and killed April 14, 1972 at a Nation of Islam mosque on W. 116th St. in Harlem.
Cardillo was killed after someone phoned in a fake officer-in-distress phone call.
The lawsuit also seeks records on surveillance of the mosque between 1970 and 1973.
At the center of the request appears to be the recording of the distress call that brought Cardillo to the scene. The group thinks a fake 911 call by the FBI started the deadly confrontation.