Book excerpt: Michael Goldfield challenges standard explanations for union decline, arguing that the major causes are to be found in the changing relations between classes. Goldfield combines innovative use of National Labor Relations Board certification election data, which serve as an accurate measure of new union growth in the private sector, with a sophisticated analysis of the standard explanations of union decline. By understanding the decline of U.S. labor unions, he maintains, it is possible to begin to understand the conditions necessary for their future rebirth and resurgence.