I think the idea comes from Galations 4:26, which reads this way in the NWT:
But the Jerusalem above is free, and she is our mother.
Freddy Franz wracked his fevered brain to equate "the Jerusalem above" with "Jehovah's organization" back in the 50's. And of course who is "Jehovah's organization" other than "the Wathtower Society"? By now, of course, "the organization" has morphed into "the geverning body".
And why exactly should the R&F still pay the price, just because Freddy deeply tucked away those highly-suppressed urges to be a cross-dresser, or being deflowered by YHWH? Did he look longingly at J Edgar Hoover, asking himself why all the Worldly heads of organizations got to have all the fun?
Hmmm, don't look now, but someone's got some SERIOUS daddy issues.... :)