WASHINGTON (AP) — The Supreme Court has sided with California agriculture businesses in their challenge to a state regulation that gives unions access to farm property in order to organize workers. As a result of the ruling, California will have to modify or abandon the regulation put in place in 1975 after the efforts of labor leader Cesar Chavez. The justices ruled 6-3 along ideological lines for the agriculture businesses. The decision is another potential setback for unions as a result of a high court decision. The case involved a regulation that granted unions access to farms and other agriculture businesses for up to three hours per day, 120 days per year, in order to organize workers.