This Cease and Desist Letter might be useful:
Sample Cease and Desist Letter for Harassment for use Against Opus Dei Operatives
Please find below a sample Cease and Desist Letter/Order that can be used against Opus Dei operatives when they are attempting to harass, pressure, intimidate and recruit potential members.
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www.crcnyc.net]
Though it is geared for the Opus Dei cult, it should be just as effective against Landmark cult members. Be sure to mail it with a record of delivery (FedEx, Delivery Confirmation).