"The question of why workers support unions is one of the most fundamental in employment relations. Using Ajzen's Theory of Planned Behavior we conduct a selective review of literature and evidence on union voting, joining, and participation. We focus primarily on the question of motivation as stemming from self-interest or from pro-social considerations. Secondary attention is given to the influence of others' views (subjective norms) and worker perceptions that they can achieve desired behaviors (perceived control or self-efficacy). We find support for the notion that workers are concerned with neither member self-interest (“just us”) alone, nor pro-social (“justice”) alone, but rather that they are motivated to form, join, and participate by both considerations. This micro-foundation for considering unions as institutions suggests that unions are neither narrow self-interested institutions nor purely pro-social movements, but “a little bit of both.” We offer propositions and consider implications for theory, practice, and future research."

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