If a government wishes to protect it citizens from the clutches of Mind Control Cults, all they have to do is make laws that allow former members to sue theirs ass off.
What if they made laws about a system the meets the 6 points mentioned by Margret Singer to manipulate a person into submission to it's directives and cause mental, physical, and emotional harm and make it possible to sue them for damages.
If such laws were in place it would spell financial ruin to all coercive authoritarian cults.