In his hotel room, the files claim, they then “discussed which women among the parishioners would be suitable for natural and unnatural sex acts”.
The FBI document says, “when one of the women protested that she did not approve, the Baptist minister immediately and forcefully raped her” as King watched.
He is alleged to have “looked on, laughed and offered advice” during the attack.
FBI agents were in the room next door, but did not intervene.
The following day, King and a dozen others allegedly participated in a “sex orgy” engaging in “acts of degeneracy and depravity”.
When one woman showed resistance, King was allegedly heard saying that performing the act “would help your soul”.
Senior FBI officials allegedly later sent a copy of the incriminating tape to King and called him an “evil abnormal beast” and told him his sexual exploits would be “on record for all time”.
The letter also suggested he should commit suicide before his wrongs were revealed to the world.
Mr Garrow said he had no idea of the scale or the ugliness of it, nor of King’s apparent indifference to rape until he saw the files.