Union security clauses are enforceable in Michigan—Non-Dues payer can be fired

Q. I run a small warehouse facility where the employees are represented by a union. The labor contract requires all employees to pay union dues or an equivalent fee. The union has contacted me and indicated that one of my laid-off employees is not in good standing for failing to pay union dues, and has requested that the employee be discharged. Even though he is laid off, the union still requires him to pay union dues. This is a good employee, and I do not want to terminate him. Am I required to do so? ...