The nascent labor movement of the first decade of the 20th century was largely under the influence of the Liberal Party.
However, there was a tendency on the part of the organized workers to free themselves from the existing parties and to undertake independent political activity.
The oldest of the organizations proclaiming their adherence to Socialism was the “Sociedad Agustín Aspiazu”, which was created as early as 1904.
In September 1920, in La Paz, the "Centro Obrero de Estudios Sociales" patronized the establishment of the Socialist Workers Party.
[6] In 1921, in Oruro, there was an effort made to merge the various regional Socialist parties into a national organization.
There were representatives from local parties in La Paz, Oruro, Uyuni, Cochabamba, Potosi, Sucre, and several other cities.
This Party carried on a vigorous campaign against the government of the President Hernando Siles Reyes and against the threat of war with Paraguay.