A deeply committed communist who wrote most of MLK's speeches, Stanley David Levison (on left, in photo) was the one the FBI originally was intersted in. They considered him genuinely dangerous. The FBI tapes of MLK were made simply as a by-product of FBI interest in Levison.
In private, MLK always self-identifieds as a Marxist, though for political reasons he was a registered Republican. Over half of his PhD thesis was plagiarized.
MLK attended a Communist teacher's academy in Tennessee and there are photos of that.
MLK often humped white prostitutes and often beat them up.
Having been handed off to MLK by the Kennedy brothers, Marilyn in shame, comitted suicide
MLK at the Highlander Folk School for Communist Cadre, school shown below
His legal name was MIKE KING.
MLK Jr.'s pastor father took a trip to Europe where he was deeply smitten by the life story of the German religious rebel/reformer Martin Luther. The man returned and legally changed his OWN name to Martin Luther King, instructing his congregation to call his son, "Martin Luther King, Jr.", which they did.
Was he charismatic, was he a powerful speaker whose caust was just...?
Yes.
Was he a leftist philanderer with very shakey academic credentials..?
Yes.
“A deeply committed communist who wrote most of MLK’s speeches, Stanley David Levison “
King had two close aides who were CPUSA, the other being Hunter Pitts O’Dell. The Kennedys warned King but he just ignored the warnings, because for one thing he already knew.
Here’s a piece from The Atlantic back in 2002:
https://www.theatlantic.com/magazine/archive/2002/07/the-fbi-and-martin-luther-king/302537/