It may be called a lot of things but I don't think its called the "law."
Oh yes it is.
14-401.14. Ethnic intimidation; teaching any technique to be used for ethnic intimidation.
(a) If a person shall, because of race, color, religion, nationality, or country of origin, assault another person, or damage or deface the property of another person, or threaten to do any such act, he shall be guilty of a Class 1 misdemeanor.
(b) A person who assembles with one or more persons to teach any technique or means to be used to commit any act in violation of subsection (a) of this section is guilty of a Class 1 misdemeanor. (1991, c. 493, s. 1; 1993, c. 332, s. 1; c. 539, s. 283; 1994, Ex. Sess., c. 14, s. 14(b); c. 24, s. 14(c); 1995, c. 509, s. 10.)
http://www.ncga.state.nc.us/EnactedLegislation/Statutes/HTML/BySection/Chapter_14/GS_14-401.14.html