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Heeding John Kelly's call to reorient the field of industrial relations towards the study of injustice, we employ mobilization, social exchange and organizational justice theories to specify and test a model of union participation. Using individual-level survey data from public-sector union members to test our model, we find that differences in worker perceptions of workplace injustice and union justice explain slightly more variation in members' union participation than more traditional measures of job satisfaction and union instrumentality perceptions. The implications of our analysis for researchers and union practitioners are also discussed. Copyright Blackwell Publishing Ltd/London School of Economics 2004.

The percentage of the U.S. work force that is unionized is at its lowest level in more than 50 years. Although many studies have sought the reasons for this decline, few have investigated characteristics of unions themselves as possible factors. This paper focuses on unions as organizations, and applies a model of national union effectiveness to union organizing. The authors propose a composite measure of organizing effectiveness that goes beyond union success in representation elections. An analysis of data from the 1990 National Union Survey and other sources, with controls for environmental influences, suggests that organizing effectiveness is enhanced by innovation and reduced by centralization of control at the national level. Some evidence is also found that internal union democracy enhances union success in organizing.

Although it is commonly argued that unions need to innovate in order to grow and achieve success, little is known about the characteristics of unions that facilitate or hinder innovation. The authors of this study develop a model of union innovation and test it using data collected from many sources, including a 1990 survey of 275 officials and staff members from 111 American national unions. The results suggest that certain union characteristics, such as environmental monitoring (systematic monitoring by the union of developments that could affect it) and rationalization (good structuring and management of administrative activities), are positively associated with innovative behavior. In addition, there is a positive relationship between innovation and the heterogeneity of a union's members.