Accusing Abbott Laboratories of surreptitiously creating and using supposedly independent organizations to persuade physicians to prescribe Depakote for medical conditions that are not on the Food and Drug Administration’s list of diseases approved for treatment with this highly profitable medication, two union health-care funds that allegedly wound up paying for off-label prescriptions of Depakote filed a class action against Abbott and AbbVie Inc. in Chicago under the Racketeer Influenced and Corrupt Organizations …