Elsewhere in the comments here, the Pulitzer Prize-winning biographer of Martin Luther King Jr (David Garrow), according to this article [1]:

"The most damaging memos describe King witnessing a rape in a hotel room. Instead of stopping it, handwritten notes in the file say he encouraged the attacker to continue."

1 - https://theconversation.com/im-an-mlk-scholar-and-ill-never-...