Can't put it a law against the people, but against the organization I think it's VERY possible! The organization is the one who tells the members to shun the people, even family, not even emailing them if they leave the religion.
For wanting religious freedom but denying people the RIGHT 'to seek happiness', 'for their OWN religious freedom', by telling their own friends and family they must be shunned should and hopefully soon will be legally forced to stop that. THEN as in all other religions, it's up to people on their own if they shun or not, NOT w/ the organization telling them to do so.