I found this fascinating quote today:
It was there that I began an association with a lawyer, Jack Kershaw, that would change my life and the lives of my wife and children. He was hired by James Earl Ray, the convicted killer of Martin Luther King Jr. to be his legal counsel during the US Government House Select Committee on Assassination Investigations. I had done some private investigative work for him and he asked me to help him with the investigation. It was agreed that my work on the case would be top secret and when I met with HSCA Chief Counsel Richard Sprague he agreed that the government would never release information on my role in the case. Later I would learn that the government didn’t stand by it’s duty to keep my job confidential.May 2009
You should read the whole article.