LAS VEGAS >> A trespassing citation at Red Rock Resort in Las Vegas has turned into a First Amendment argument as the case progresses.

The Las Vegas Review-Journal reports that two Culinary Union representatives were cited for trespassing after they were seen slipping fliers under guest room doors in December. Prosecutors have since accused the union members of vagrancy and say the wording on the fliers — which were about a labor dispute — annoyed the resort and its parent company, Station Casinos.

Station Casinos spokeswoman Lori Nelson declined to comment.

The Culinary Union has been trying to organize at the Red Rock Resort for years. The union held a protest at the resort as recently as February.

Assistant District Attorney Christopher Lalli says prosecutors stay out of labor disputes during public outdoor protests but not when they are inside the building.