Workers who filed a class-action lawsuit against a Kansas slaughterhouse for unpaid wages and overtime have asked a federal judge to bar Creekstone Farms Premium Beef from discovering their immigration status during the litigation.

The employees have asked U.S. District Judge Eric Melgren for a protective order prohibiting the Arkansas City meatpacker from receiving from the named plaintiffs — or any other workers who opt into the lawsuit — any information pertaining to their present names or any other names they may have used.

They also seek to avoid having to disclose their place of birth, Social Security number and any present or prior addresses. The plaintiff's motion also seeks an order protecting the workers from having to turn over to Creekstone Farms any tax returns or any other tax forms filed under any of their identities or having to disclose the dates and times of entry into the United States. They also want to avoid turning over all identification documents likely to lead to the discovery of their immigration status.

Their attorney, Mark Kistler, told The Associated Press Tuesday that the courts already have decided that these types of information which could lead to discovery of immigration status should be protected from discovery during a lawsuit.