"This study seeks to advance the scholarship on trade union heterogeneity. Expanding on previous research, we develop a theoretical framework that distinguishes unions along two dimensions—members' labor market risk exposure and the predominance of white-collar workers—that help shape their labor market policy preferences and advocacy. The framework is then assessed in a within-country mixed-methods analysis. We first document how members in 35 Swedish unions map onto the two dimensions, using fine-grained survey data, and then qualitatively analyze the advocacy of seven unions with different membership characteristics. Our results confirm the relevance of isolating the two dimensions in analyses of both membership preferences and elite advocacy. These findings contrast with existing accounts of the contemporary Swedish union movement and carry implications for many other countries with fragmented union landscapes. They particularly demonstrate the importance of disaggregating union membership in micro- and macro-level research involving unions and their power resources."

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