The U.S. Supreme Court agreed Friday to hear a property rights challenge to a 45-year-old California labor law that allows union organizers to go on farmland to speak with workers at the start of their day or during a lunch break.

Several growers backed by the California Farm Bureau contend the law should be struck down as unconstitutional because it amounts to the government taking private property.

Lawyers for the Pacific Legal Foundation, who filed the appeal, called it a “union trespass law.”