In November 1964, the FBI sent Martin Luther King Jr. a package, containing a letter and several recordings. Besides a few dirty jokes, the recordings mainly consisted of King having sex with women other than his wife. The letter concludes with a warning: “[T]here is only one thing left for you to do. You know what it is. You have just 34 days in which to do (this exact number has been selected for a specific reason, it has definite practical significant. There is but one way out for you.” King and others interpreted this as a veiled threat, and a suggestion that he commit suicide. It’s unclear what the 34 days referred to, but presumably it was to prevent King from accepting his Nobel Peace Prize in Oslo, on 10 December.
If you want to read more about this search “Cointelpro” (Counter Intelligence Program). There is a lot of information on the web but I’ll let you sort conspiracies (and FBI propaganda) from what you take as truth. I believe the anonymous activists (Citizens’ Commission to Investigate the FBI) who broke in to the FBI to steal and leak these papers are as important and as deserving of respect as Daniel Ellsberg and Bradley Manning.