Abstract
This article builds on social movement theory to explain ideological variation among socialist, social democratic, and labor parties across 18 countries in the early twentieth century. We propose a causal argument connecting (1) the political emergence of the bourgeoisie and its middle-class allies to (2) the political space for labor unions and working-class parties, which (3) provided a setting for internal pressures and external opportunities that shaped socialist party ideology. Combining quantitative analysis and case studies, we find that the timing of civil liberties and the strength of socialist links with labor unions were decisive for reformism or radicalism. Refining Lipset's prior analysis, we qualify his claim that male suffrage provides a key to socialist orientation.
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