In 1966 plaintiff, claiming that he had been underpaid during the tenure of his employment by the Columbia Broadcasting System as a band conductor on the Jack Sterling radio program,* submitted the issue to arbitration under the aegis of the defendant unions. After a hearing, recovery was denied. No effort was made to set aside this award; rather, plaintiff instituted suit in a New York *700court against C.B.S. in which he sought substantially the same relief. The case was removed to the United States District Court for the Southern District of New York where Judge Tyler, ruling that the arbitration award was res judicata, granted summary judgment for C.B.S. No appeal was taken from this judgment.

Plaintiff then commenced the present action against the unions charging that they breached their duty to fairly represent him in connection with the C.B.S. arbitration. Judge Motley dismissed the complaint on the grounds that plaintiff was bound, under the doctrine of collateral estoppel, by Judge Tyler’s decision that the arbitration was binding and hence plaintiff’s claim against C.B.S. had been foreclosed. Now, by appealing from Judge Motley’s dismissal of the complaint before us, he seeks to relitigate, by a charge of breach of fiduciary relationship, the very issue of the validity of the award, which Judge Tyler has decided adversely against him. Since we believe that plaintiff’s present claim is barred by Judge Tyler’s decision, which Allessan-drini failed to appeal, we need not intimate any views on the further reasons given by Judge Motley for dismissing the complaint.

Affirmed.