Solidarity has long been considered essential to labour, but many fear that it has declined. There has been relatively little scholarly investigation of it because of both theoretical and empirical difficulties. This article argues that solidarity has not declined but has changed in form, which has an impact on what kinds of mobilization are effective. We first develop a theory of solidarity general enough to compare different forms. We then trace the evolution of solidarity through craft and industrial versions, to the emergence of collaborative solidarity from the increasingly fluid ‘friending’ relations of recent decades. Finally, we examine the question of whether these new solidarities can be mobilized into effective collective action, and suggest mechanisms, rather different from traditional union mobilizations, that have shown some power in drawing on friending relations: the development of member platforms, the use of purposive campaigns and the co‐ordination of ‘swarming’ actions. In the best cases, these can create collective actions that make a virtue of diversity, openness and participative engagement, by co‐ordinating groups with different foci and skills.

Organizations often require managers to travel globally to fill international roles. Attending to fit with an organization's need for international mobility and global openness during recruiting could increase the proportion of effective global managers in an organization's applicant pool. We use recruitment research and theory to develop and test a conditional process model of the relationship between recruitment messages and job seeker perceived fit, attraction, and job pursuit intentions, depending on job seekers’ global openness and willingness to travel globally. Recruitment messages include information about a job's travel requirements and the global presence of the business. Two studies were undertaken to test our hypotheses. Analyses were conducted with conditional process modeling using nonlinear bootstrapping. Study 1, involving 230 job seekers, found that applicants’ willingness to travel interacted with recruiting messages about a job's global travel requirements to relate to job pursuit intentions through perceived job fit and job attraction. Study 2, involving 260 participants recruited through Mechanical Turk, indicated that global openness interacted with a global recruitment message, and willingness to travel interacted with a travel recruitment message, to relate to job pursuit intentions through job and organizational dimensions of perceived fit and attraction.

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I find that school union representatives' 'boundary spanning' communications throughout the school district predict the diffusion of knowledge between schools. Hence, my data reveal school union representatives as critical conduits for improvement-related knowledge transfer and innovation. Yet, I also find that these external networks interact strongly with the level of workforce participation characterizing each school: The effects of external networks on internal knowledge diffusion are considerably stronger in more participative schools compared to less participative schools. This research contributes to industrial relations scholarship by demonstrating how union-related institutions can foster unique social structures that directly strengthen innovation-related capabilities, as well as how the efficacy of these networks depends on managerial norms at different areas of the organization. This study is also of timely practical relevance at a time when labour unions are increasingly painted as obstacles to, rather than potential facilitators of, improvement and innovation.