The pervasive influence of public sector unions on national policy is delved into at greater depth by Dr. Leo Troy in Public Sector Unionism at Home and Abroad. To better appreciate the direction unionism may ultimately lead the United States, Dr. Troy surveys the industrial relations systems in Western Europe, Canada and Japan. He concludes that "it is evident that close links between political parties of the left and union groups is part of the political economy abroad. Those who think that the same is less true of the United States are overlooking the deepening commitment of the AFL-CIO to the Democratic Party in this country."