The relationship between the political and industrial wings of the European left has undergone a profound transformation since the 1970s. While the left has dominated government in some countries and union density and organizational strength have held up well in others, the range and scope of social change that labor unions and left parties can contemplate today is narrower than at any time in the last seventy years. One has to look back to the 1920s for a similar set of constraints imposed upon the workers' movement. Even where the left holds power, its programs have become more cautious, less redistributive, and in some cases barely distinguishable from those of electoral competitors on the right. Similarly, even where unions have maintained membership levels, their concrete gains have been reduced. Bargaining agendas are now dominated by the concerns of employers, not workers. Witness the conversion from the 1960s to the 1990s of debates on participation: the concepts of worker power and selfmanagement have been curiously transformed into the current enthusiasm among employers and conservative governments for quality circles and employee participation. The essays in this issue of the International Journal of Political Economy examine the complexion of the left today through the prism of the union-party relationship. The left has traditionally consisted of these two vehicles of mobilization; their relationship has been central to the strategic capacity and the selfconception of progressive forces. The so-called transmission belt between communist, socialist, or social democratic parties and organized labor consisted of linking action between the political and economic spheres, through a division of labor, towards a shared vision of society. The capacity to achieve the goals of one has depended on the involvement of the other. Constituencies of unions and left parties have historically overlapped. Thus, the focus upon the union-party nexus provides a window onto the fortunes of both organizations and the character of the left. The four cases examined in this issue Britain, Germany, France, and Spain exhibit a series of contrasts. The political parties range from the Mediterranean socialist parties, which experienced tremendous electoral success in the 1980s, through the electoral failure of the British Labour Party and the German Social Democrats (SPD), to the organizational and electoral crises of the