McAULIFFE, Judge.
Resolution of this appeal requires consideration of the scope of federal pre-emption in the field of labor law, as well as consideration of the doctrine of mutual collateral estoppel.
The Petitioner, Lawton Edward Ewing, was hired by Koppers Company, Inc. (the employer) in 1961. He was a member of the International Association of Machinists and Aerospace Workers, Lodge 1784 (the Union), and the terms and conditions of his employment were...
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