Before there was a Lafayette Ron Hubbard, there was a Joseph Franklin Rutherford, to be sure! Each in his own way was a nasty piece of business.
If we (all of us today) were living during the Rutherford era, the Judge could easily have been exposed as a cult leader. However . . . the modern concept of a cult has been slow to develop and it takes the era of the internet and World Wide Web and Television to reach enough people with such an expose'.
The newspapers were the only tool in the toolbox way back a century ago for exposing reckless, crooked, pathology in organized religion.
The newspaper, The Brooklyn Eagle, led the charge against Russell and Rutherford. You can visit the archives and dig out all sorts of remarkable revelations about these hucksters.
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Today, the tolerance of the public at large for wacky religious racketeering is rather high and it is difficult to shock anybody with revelations of malfeasance. TV evangelists and their money-mongering is old news.
Child molestation by priests is old news.
Doomsday cults with failed predictions are old news.
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What makes Scientology such an interesting subject is as others have commented here.
Science Fiction writers don't often invent religions based on Gnosticism and pure imagination.
Religious practitioners don't usually employ gizmos with galvanic skin response detectors to uproot and expose hidden demons.
Religious leaders don't usually hide from the limelight like Howard Hughes or make war against the I.R.S. and win!
Religious dissidents aren't usually imprisoned by their leaders for years at a time voluntarily!
How many religious centers in big cities have successfully co-opted the local police department?
Top box-office stars aren't usually spokesmen for religion.
And on and on. . .