ABSTRACT
Multiple organizational involvement can serve as a source of union solidarity, partially supporting the solidarity hypothesis. The solidarity impact of organizational involvement varies also with the respondent’s religious affiliation and gender. The extent to which multiple organizational involvement affects union activism depends on the type of organization, gender and religious affiliation, and the nature of union activism. The interinstitutional competition hypothesis receives clear support in the examination of the union-household relationship for women unionists. The solidarity effect of involvement in the informal organization within a movement organization also may promote union participation. The finding that organizational involvement generally fails to affect these core union activists is important because it implies that the solidarity effect through extra-union organizational involvement is not instrumental in promoting active leadership roles. The profile of union activists differs from the profiles of extra-organizational activists. The present research has important theoretical implications for theories of social movement participation.
