It's no secret J. Edgar Hoover wanted to see Dr. King discredited.
J. Edgar Hoover, Director of the FBI authorized many operations that sought to discredit alleged opponents of the United States Government that included covert campaigns of disinformation, blackmail and harassment.
“We must mark him now, if we have not done so before, as the most dangerous negro of the future in this Nation from the standpoint of Communism, the negro and National Security” - FBI Domestic Intelligence Chief William Sullivan.
“You have just 34 days. You are done. There is but one way out for you. You better take it before your filthy abnormal fraudulent self is bared to the nation.”
Extensive surveillance failed to show that King was a Communist. However, the investigations did produce evidence of extramarital sexual liaisons, and they were recorded on tape.
Copies were later sent to King's home and discovered by his wife, Coretta Scott King. Dr. King assumed the letter and tape were from the FBI and a little more than a decade later, the Senate’s Church Committee on intelligence overreach confirmed this suspicion.
This should serve as a reminder of what Government Surveillance Agencies are capable of.And by Government Surveillance Agencies, I am really talking about all of them, because they are all capable. In this day and age, there is no true personal privacy, unless you decide to disconnect from the real world and live under a rock.