Social Democratic Union 'Proletarian' was a political party organization in Bulgaria from 1906 until 1908. The organization was led by Dimitar Blagoev, who had been expelled from the Narrow Socialists for being an "anarcho-liberal". 'Proletarian' merged with the Broad Socialists, and would represent the left-wing tendency within that movement from 1909 onwards.
References
- Linden, Marcel van der, and Jürgen Rojahn. The Formation of Labour Movements, 1870–1914: An International Perspective. Contributions to the history of labour and society, vol. 2. Leiden: E.J. Brill, 1990. p. 406.
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