List of Social Democratic Party (Finland) breakaway parties explained

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

Year	Party		Leader	Status
1918		Communist Party of Finland^[1]	Yrjö Sirola	defunct
1920		Socialist Workers' Party of Finland^[2]	August Raatikainen	defunct
1959		Social Democratic Union of Workers and Smallholders^[3] ^[4]	Emil Skog	defunct
1973		Socialist Workers Party^[5]	Pentti Waltzer	defunct
1998		Reform Group^[6] ^[7]	Risto Kuisma	defunct

Notes and References

1. Tauno Saarela: Suomalaisen kommunismin synty 1918–1923 (Kansan sivistystyön liitto 1996), p. 148–161.
2. Tauno Saarela: Suomalaisen kommunismin synty 1918–1923 (Kansan sivistystyön liitto 1996), p. 148–161.
3. Rauli Mickelsson. Suomen puolueet - Historia, muutos ja nykypäivä. Vastapaino 2007.
4. Kevin Devlin: Death of a Splinter Party: Finland's Left-Socialists Give Up (Radio Free Europe 5.12.1972)
5. Marja Haapio & Matti Virtanen: Vasemmistoliiton "torikokous" kerää monenlaisia sosialisteja (Helsingin Sanomat 8.2.1990)
6. [Dieter Nohlen|Nohlen, D]
7. Nohlen & Stöver, p621