List of Social Democratic Party (Finland) breakaway parties

Since the founding of Social Democratic Party of Finland in 1899 it has seen a steady number of splits and breakaway factions. Some of the breakaway organisations have thrived as independent parties, some have become defunct, while others have merged with the parent party or other political parties

YearParty Leader Status1918Communist Party of FinlandTauno Saarela: Suomalaisen kommunismin synty 1918–1923 (Kansan sivistystyön liitto 1996), p. 148–161.Yrjö Siroladefunct1920Socialist Workers' Party of FinlandTauno Saarela: Suomalaisen kommunismin synty 1918–1923 (Kansan sivistystyön liitto 1996), p. 148–161.August Raatikainendefunct1959Social Democratic Union of Workers and SmallholdersRauli Mickelsson. Suomen puolueet - Historia, muutos ja nykypäivä. Vastapaino 2007. Emil Skogdefunct1973Socialist Workers PartyMarja Haapio & Matti Virtanen: Vasemmistoliiton "torikokous" kerää monenlaisia sosialisteja (Helsingin Sanomat 8.2.1990)Pentti Waltzerdefunct1998Reform GroupNohlen, D & Stöver, P (2010) Elections in Europe: A data handbook, p612 Nohlen & Stöver, p621 Risto Kuismadefunct

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