In California, new lawsuits aim to make unions respect the Supreme Court's authority. The U.S. Supreme Court's decision from June in Janus v. the American Federation of State, County and Municipal Employees was clear: Public employees no longer are required to pay union dues, even for collective-bargaining purposes. This was no technical or ambiguous point. The court declared it an infringement of the First Amendment when the government forces workers to financially support organizations that they don't want to support. Case settled, right? Not entirely. Public-sector unions, especially in California, aren't used to finding themselves on the losing end of...