A Nevada judge is keeping sealed a legal exhibit that a newspaper, a union and a Washington, DC-based advocacy group sought to make public in a closely-watched wrongful termination case against casino company Las Vegas Sands Corp., Sands China Ltd. and the companies’ chairman Sheldon Adelson. Guardian News & Media, the Campaign for Accountability and union Unite Here argued Thursday the public should see the exhibit the groups say may tie the companies to organized crime in Asia.