A hearing is set for today in Southern Illinois on a request by AFSCME for an injunction against the Quinn administration.
The union wants a judge to block the governor from continuing to transfer inmates out of the Tamms Correctional Center and other prisons that Quinn has slated for closure.
Union officials say the transfers are adding to dangerous overcrowding in other prisons, putting inmates and staffers at risk.
AFSCME wants the court to order a halt to any moves to close the prisons until issues of safety and other concerns can be worked out through the grievance process.
Meanwhile, the Associated Press reports that the Illinois State Police are conducting a criminal investigation at the Tamms Correctional Center about the process of closing the prison.