The anonymous letter was the result of the FBI’s comprehensive surveillance and harassment strategy against Dr. King, which included bugging his hotel rooms, photographic surveillance, and physical observation of King’s movements by FBI agents. The agency also attempted to break up his marriage by sending selectively edited “personal moments he shared with friends and women” to his wife.Portions of the letter had been previously redacted. One of these portions contains a claim that the letter was written by another African-American: “King, look into your heart. You know you are a complete fraud and a great liability to all us Negroes.” It goes on to say “We will now have to depend on our older leaders like Wilkins, a man of character and thank God we have others like him. But you are done.” This line is key, because part of the FBI’s strategy was to try to fracture movements and pit leaders against one another.The entire letter could have been taken from a page of GCHQ’s Joint Threat Research and Intelligence Group JTRIG—though perhaps as an email or series of tweets. The British spying agency GCHQ is one of the NSA’s closest partners. The mission of JTRIG, a unit within GCHQ, is to “destroy, deny, degrade [and] disrupt enemies by discrediting them.” And there’s little reason to believe the NSA and FBI aren’t using such tactics.