NRS 207.180: Threatening or obscene letters or writings.

1. Any person who knowingly sends or delivers any letter or writing:

(a) Threatening to accuse another of a crime or misdemeanor, or to expose or publish any of the other person’s infirmities or failings, with intent to extort money, goods, chattels or other valuable thing; or

(b) Threatening to maim, wound, kill or murder, or to burn or destroy the house or other property of another person, or to accuse another of a crime or misdemeanor, or expose or publish any of the other person’s infirmities, though no money, goods, chattels or other valuable thing be demanded,

Ê is guilty of a misdemeanor.

2. Any person who:

(a) Writes and sends, or writes and delivers, either through the mail, express, by private parties or otherwise, any anonymous letter, or any letter bearing a fictitious name, charging any person with crime; or

(b) Writes and sends any anonymous letter or letters bearing a fictitious name, containing vulgar or threatening language, obscene pictures, or containing reflections upon his or her standing in society or in the community,

Ê is guilty of a misdemeanor.