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For many years students of industrial relations have studied Sumner Slichter's Union Policies and Industrial Management, published in 1941 by the Brookings Institution. However, the increases in union membership following the Supreme Court's approval of the Wagner Act and the decisions of the War Labor Board have both helped to change industrial relations so that the earlier study, a classic in its time, has become out of date. Professor Slichter was asked
Vyver et al. (Sun,) studied this question.