Socialist Workers’ Party of Finland (Finnish: Suomen Sosialistinen Työväenpuolue) was a Finnish political party in the early 1921s. The SSTP consisted of radical leftists who split from the Social Democratic Party of Finland after the Finnish Civil War of 1918. The banned Communist Party of Finland (SKP) was the main force behind the party but other socialists were also involved. The SSTP was banned in 1923 and its leading members including 27 members of parliament were jailed.