Partido Socialista Puertorriqueño records, 1971-1993

The Partido Socialista Puertorriqueño (PSP) was a leftist pro-independence political party established in 1971 and dissolved in 1993. Its primary goal was to achieve independence for Puerto Rico from the United States and to create a "democratic workers' republic." The party was formed from another organization called the Movimiento Pro-Independencia (MPI), which was founded in 1959 to unify various pro-independence groups following the establishment of the Estado Libre Asociado and the rise of the Cuban Revolution.

The PSP ran candidates in 1976 and 1980, successfully electing two representatives in the latter election. However, despite its limited electoral success — never garnering more than 1% of voter support — the PSP used its platform to spread ideas and promote a vision of political change through organizing efforts, the publication of the influential weekly newspaper Claridad, and the annual cultural Festival de Claridad, among other initiatives. Its policies favored the workers' movement, artistic autonomy, and environmental rights.

Beginning in 1961, the PSP created "misiones," or branches, in the United States to engage with growing Puerto Rican communities, particularly in Chicago and New York. Working "en las entrañas" (in the entrails), these U.S. branches aimed to raise awareness, recruit members, and politically mobilize the Puerto Rican diaspora to contest U.S. imperialism. The New York branch of the PSP played a crucial role in organizing a pro-independence rally that attracted a capacity crowd of 20,000 people to Madison Square Garden on October 27, 1974, which was also broadcast on television. expressed solidarity with the people of Vietnam, and protested against the drafting of Puerto Ricans into the U.S. Army.