Sens. Elizabeth Warren (D-Mass.) and Bernie Sanders (I-Vt.) sent a letter to Kroger on Wednesday asking whether the grocery store chain plans to pay its workers who say they were victims of wage theft.

Kroger employees have recently filed a spate of lawsuits alleging that the companys new payroll system has left their paychecks short. As HuffPost recently reported, one union said it had received hundreds of employee complaints regarding incomplete pay or unauthorized deductions.

Warren and Sanders told Kroger CEO Rodney McMullen that they would like some answers (full letter below).

Given your companys record of anti-worker policies, and your ongoing attempt to push through a merger that would harm both consumers and workers, the senators wrote, we are writing to request a full explanation of how your workers will be compensated for any lost or delayed wages, and how you will prevent future wage theft.

In a proposed class-action lawsuit filed in federal court in Virginia, one Kroger worker said her health insurance premiums had been deducted twice from her paychecks, while another said the company had failed to pay her time-and-a-half for her overtime hours.