Recognized between 1880 and 1910 by its trademark label "Iowa's Pride," John Morrell and Company is best known for contributing one of the most important local unions to the progressive United Packinghouse Workers of America. During the 1930s and 1940s, its members pursued a militant brand of unionism. By the early 1950s, the local's militancy became a source of contention among the membership. By explaining the effect of Morrell-Ottumwa's union leaders on local and state Democratic politics, especially in the development of the Congress of Industrial Organizations' Iowa State Industrial Union Council and the AFL-CIO's Iowa Federation of Labor, Wilson Warren makes an important contribution to the literature on labor's involvement in the Democratic party's ascendancy across much of the industrial North following World War II.

This history of Ottumwa's meatpacking workers provides insights into the development of several forms of labor relations, including the evangelical Christian paternalism, welfare capitalism, and unionism that were distinctive to one blue-collar community but that also reflected workers' experiences in many other rural midwestern industrial communities. By carefully analyzing all relevant labor and industrial sources and by revealing the deeply held aspirations and concerns expressed by both workers and managers, Warren constructs a window through which Iowa's industrial and labor history over the past 120 years can be viewed.

After Upton Sinclair's powerful novel appeared in 1906, “the jungle” became a compelling metaphor for life and work in the nation's meatpacking industry. Harsh living and working conditions from the killing floor to the hide cellar to the packingtowns, cycles of overwork and underemployment, and the ever-present crowds of new and unskilled laborers characterized an often-violent industry in which the appetite of workers for the protection of unions was exceeded only by the zeal of their employers to prevent workers from organizing. Unionizing the Jungles—which originated in a seminar at the University of Iowa sponsored by the Center for Recent United States History—brings together historians and anthropologists whose studies of various phases of the meatpacking industry, its unions, and its impact on communities in the twentieth century both raise and answer important questions.

The rise and decline of industrial unionism in the packinghouse industry is a unique story that casts into bold relief the conflicts between labor and capital and the tensions based on race and gender in a perpetually changing workforce. The essayists in Unionizing the Jungles discuss the structurally distinctive features of the packinghouse industry—such as the fact that violence and extreme antiunionism were central elements of its culture—the primary actors in the union-building process, the roots of the distinctive interracialism of the United Packinghouse Workers of America and the explosion of industrial unionism in the 1930s, and the community-based militant unionism of the Independent Union of All Workers. Central themes throughout these essays include the role of African American workers, the constant battle for racial equality, and the eruption of gender conflict in the 1950s. Structural and technological changes in the corporate economy, the increased mobility of capital, and a more hostile political economy all contributed to the difficulties the labor movement faced in the 1980s and beyond.

Focusing on the workplace and the community as arenas of conflict and accommodation, the new labor historians in these vigorous essays consider the historical and contemporary problems posed by the development of the packinghouse industry and its unions and reflect on the implications of this dramatic history for the larger story of the changing relations between labor and capital in mass production.