[2] Led by Marcelo Quiroga Santa Cruz, Mario Miranda Pacheco, Alberto Bailey Gutiérrez, and Guillermo Aponte Burela.
[3] The Socialist Party declared itself to be Marxist and independent of Soviet or Chinese influence, favoring popular anti-imperialist unity, directed by the working class, which would end domestic injustice and foreign intervention.
Marcelo Quiroga Santa Cruz, in particular, had established a deserved reputation for honesty and courage during the President René Barrientos years, when he had several times been arrested and imprisoned by the police.
[6] Some elements in the conservative military feared Marcelo Quiroga Santa Cruz's potential following as an opposition leader and he was killed during the Luis García Meza Tejada coup of 17 July 1980.
[7] In 1984 the Socialist Party-One absorbed the small ultra-left “Spartacist Revolutionary Movement” (Movimiento Revolucionario Espartaco, MRE), led by Dulfredo Rua.