Sources claim that nearly 50 years ago, the FBI sent Martin Luther King, Jr. a letter threatening to make public sordid details of his sex life if he didn’t do the “one thing left for you to do.”
Secular Talk video.
More:
New York Times article:
http://www.nytimes.com/2014/11/16/magazine/what-an-uncensored-letter-to-mlk-reveals.html
OK, Fine. 