It is Abernathy himself that said King got violent with women.
Also some here have said they were aware he beat prostitutes.
I suspect some of the violence was during the orgies.
It is entirely possible that the FBI files were embellished or even doctored. We saw what they are capable of during the Mueller investigation. However, I do think J. Edgar Hoover was mostly a good and faithful public servant, quite opposite the partisan hack James Comey.
It is also clear that Ralph Abernathy greatly admired and respected MLK from our dinner conversation of some four decades ago. He must have done something to deserve it.