His book adds significantly to a growing body of literature treating the enormously complex interplay of class and race."Labor Studies Journal"
"Letwin successively examines the impact of the Greenback Labor Party, the Knights of Labor and the United Mine Workers of America as each fought against the power of the coal operators and in the process helped define race relations in the workplace. . . . This is a clear and well-written book which deserves to be on undergraduate reading lists as an example of how the new labour history handles the complex interrelationship between race and class."--Journal of American Studies