Scientology was written by a sci-fi author.
Some in the organization are pretty rough (verbally harassing and extorting) on those who want to leave the cult or even more explicitly, expose what they saw while in the cult.
The process of cleansing yourself of impurities is called “auditing” and it will cost you $$$ to read the grand SF novel that “ElRonHoover” wrote.
Germany tried to prohibit it. Bill Clinton saw it become officially recognized as a religion and not a business by our government.
I’m aware of Scientology using such tactics to coerce people into not leaving the faith. However, this sort of thing happens in other situations. It certainly is not unique to Scientology. People have to look before they leap, and no amount of government protection or regulation is going to change that.