‘The arc of the moral universe is long, but it bends toward justice' was written by a Communist not by Martin Luther King

I saw this famous and beautiful quotation from Martin Luther King Jr just now, checked, and found as I expected that it was written by Stanley Levison, his Communist friend, speechwriter and adviser. So was the 'I have a dream' speech.

Stanley Levison said to another of King's advisors, Clarence Jones, "King is such a slow thinker he is usually not prepared to make statements without help from someone", according to a declassified FBI document from 1968, "Martin Luther King Jr., A Current Analysis".

Levison told Jones that "under no circumstances should King be permitted to say anything without their approving it".