(CNN) A federal lawsuit aims to keep "vegan bacon," "meatless meatballs," "vegan chorizo" and "meatless hot dogs" on the menu in Mississippi.

Upton's Naturals Co., an illinois-based vegan food company, and the Plant Based Foods Association, an industry group, say the law violates their First Amendment right to free speech.

Their lawsuit was filed Monday, the same day the law went into effect.

Mississippi Agriculture and Commerce Commissioner Andy Gipson, who's named in the lawsuit along with Gov. Phil Bryant, says that the law is intended to avoid confusing and misleading packaging.