The US Supreme Court will not get involved in the legal dispute over control of the Napa Valley wine name.

At issue is a law from 2000 that states that wine sold with "Napa" on the label must be made from at least 75% Napa-grown grapes.

Without making any comments, the Supreme Court let stand a lower court ruling that backed the law.

Bronco Wine Co was contesting the law, arguing it was unconstitutional because it imposed on the company's free speech and interferes with interstate commerce. Bronco also contends the law bans labels already approved by federal regulators.

Bronco, which is based in California, makes Napa Ridge, Rutherford Vintners and Napa Creek wines from grapes grown outside the Napa Valley.