RGRNCA stands for rec.games.roguelike.nethack CR3T1NZ Advisory. RGRNCA is a paramilitary (or kind of military) group that... educates d00dz and spammers who think r.g.r.n is a newsgroup dedicated for warez trading, "net hacking" and so on - and as anyone can see, the group is not for such activities, it is dedicated for discussion about Nethack computer game. RGRNCA is run by WWWWolf and other individuals.