In Lochner v. New York (1905), the U.S. Supreme Court invalidated a law of New York that prohibited bakers from working more than 10 hours a day, or more than 60 hours a week. This ruling stood as a precedent for decades against government regulation of the workplace, until the late 1930s when Justices appointed by Franklin Delano Roosevelt comprised a majority for upholding regulations of the New Deal.
It is generally regarded as anticanon and although some libertarians have praised it, conservatives such as Judge Robert Bork[1] and Justice Antonin Scalia[2] have criticized it as a rare example of conservative judicial activism.