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The Workers' Socialist Organization (Spanish: Organización Socialista de los Trabajadores, OST) was a small Trotskyist political party in Bolivia.

The Workers' Socialist Organization was established by a dissident fraction which broke away from the Communist Vanguard of the Revolutionary Workers' Party in 1978. It was led by Sonia Montafto.

In 1979 the OST allied with the Socialist Party-One and its candidate Marcelo Quiroga Santa Cruz.

In 1980 the OST allied with the Revolutionary Party of the Nationalist Left and its candidate Juan Lechín Oquendo.

Notes

1. Charles Hobday. Communist and Marxist parties of the world. Longman, 1986. P.351.
2. Political parties of the world. Longman, 1988. P.71.
3. Elections in the Americas : a data handbook / ed. by Dieter Nohlen, Vol. 2. : Oxford Univ. Press, 2005. P.151.
4. James Dunkerley. Bolivia: coup d'état. Latin America Bureau, 1980. P.15.

v t e Political parties and alliances in Bolivia
Legislative caucuses	Movement for Socialism Civic Community Creemos
National parties	Bolivian National Action Christian Democratic Front for Victory Movement for Socialism Nationalist Democratic Action National Unity Front Revolutionary Left Front Revolutionary Nationalist Movement Social Democratic Movement Solidarity Civic Unity Third System Movement
Defunct major parties	Constitutional Conservative Liberal Republican Genuine Republican Nationalist United Socialist Republican Socialist Unity Authentic Revolutionary Popular Christian Movement Left-wing Revolutionary Nationalist Movement Revolutionary Left Movement Conscience of Fatherland New Republican Force
Defunct major alliances	Socialist Single Front Concordance Front of the Bolivian Revolution Democratic and Popular Union National Civic Union Revolutionary Nationalist Left Revolutionary Nationalist Movement–Alliance Patriotic Accord Social Democratic Power National Convergence Democratic Unity

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