# Sidney Fix Marques dos Santos > dead or missing person in the Brazilian dictatorship **Wikidata**: [Q17413885](https://www.wikidata.org/wiki/Q17413885) **Source**: https://4ort.xyz/entity/sidney-fix-marques-dos-santos ## Summary Sidney Fix Marques dos Santos was a Brazilian programmer, publisher, and head teacher who was disappeared during the Brazilian military dictatorship. A member of the Trotskyist Revolutionary Workers' Party (Partido Operário Revolucionário Trotskista), he is recognized by the National Truth Commission as a victim of the political repression led by the Brazilian government. He was disappeared in Buenos Aires, Argentina, in 1976. ## Biography - **Born:** January 20, 1940, in São Paulo, Brazil - **Nationality:** Brazil - **Education:** University of São Paulo - **Known for:** Being a dead or missing person politically active during the Brazilian dictatorship; Member of the Partido Operário Revolucionário Trotskista. - **Employer(s):** Not specified (worked as a programmer, publisher, and head teacher). - **Field(s):** Software Development, Education, Political Activism ## Contributions While specific technical or published works are not detailed in the provided records, Sidney Fix Marques dos Santos is noted for his professional versatility and political engagement during a turbulent historical period. * **Professional Roles:** He worked across distinct sectors as a **programmer** (an early practitioner of software engineering), a **publisher**, and a **head teacher**. His affiliation with the University of São Paulo suggests a strong academic or technical background. * **Political Activism:** Dos Santos was a committed member of the **Partido Operário Revolucionário Trotskista** (Trotskyist Revolutionary Workers' Party). He operated under the pseudonyms **"Eduardo," "Eduardo Farias,"** and **"Lalo"** to conduct his political activities. * **Historical Record:** His life and disappearance are documented in the *Report of the National Truth Commission* (Relatório da CNV), contributing to the official historical record of human rights violations during the dictatorship. ## FAQs ### Q: When and where did Sidney Fix Marques dos Santos disappear? A: He disappeared on **February 15, 1976**, in **Buenos Aires, Argentina**. ### Q: Who is held responsible for his death? A: According to the National Truth Commission, the **Federal Government of Brazil** is responsible. Official sources specifically name General Antônio da Silva Campos, General Ernesto Beckaman Geisel, and Octavio José de Almeida Goulart in connection with the case. ### Q: What political party was Sidney Fix Marques dos Santos affiliated with? A: He was a member of the **Partido Operário Revolucionário Trotskista** (Trotskyist Revolutionary Workers' Party). ### Q: What aliases did he use? A: He used the pseudonyms **Eduardo**, **Eduardo Farias**, and **Lalo**. ## Why They Matter Sidney Fix Marques dos Santos represents the transnational reach of the political repression that occurred during the Brazilian military dictatorship. His disappearance in Buenos Aires highlights the coordinated efforts between South American regimes to target political dissidents, a phenomenon later investigated extensively by bodies like the National Truth Commission (CNV). As a professional who bridged the fields of technology and education, his fate underscores the broad demographic impact of the dictatorship, which extended beyond career politicians to students, educators, and technical professionals. The official attribution of his death to the highest levels of the Brazilian government (including General Ernesto Geisel, then President of Brazil) provides a definitive historical acknowledgment of state responsibility, vital for memory, justice, and the preservation of democratic history in Brazil. ## Notable For * **Victim of the Dictatorship:** Recognized officially as a "dead or missing person in the Brazilian dictatorship." * **Targeted in Operation Condor:** Disappeared in Buenos Aires in 1976, reflecting the cross-border nature of the repression. * **University Affiliation:** Educated at the University of São Paulo (USP). * **Multi-disciplinary Professional:** Worked as a programmer, publisher, and head teacher. * **Official Recognition:** His case is cited in the *Report of the National Truth Commission* (Relatório da CNV). ## Body ### Early Life and Education Sidney Fix Marques dos Santos was born on January 20, 1940, in São Paulo, Brazil, to parents Cherubim Marques dos Santos and Suzana Olga Fix Marques dos Santos. He attended the **University of São Paulo**, a major center for academic and political life in Brazil. He spoke Portuguese. ### Professional Career Dos Santos established a diverse professional background. He was recognized as a **programmer** and **software engineer**, roles that placed him in the nascent technology sector of the mid-20th century. Additionally, he contributed to the field of education as a **head teacher** and worked in the publishing industry. ### Political Activity and Disappearance A member of the **Partido Operário Revolucionário Trotskista**, dos Santos was politically active during a period of intense military rule. To protect his identity, he utilized the aliases **Eduardo Farias**, **Eduardo**, and **Lalo**. On **February 15, 1976**, dos Santos disappeared in **Buenos Aires, Argentina**. At the time, many Brazilian political exiles had sought refuge in neighboring countries like Argentina, though repressive regimes often collaborated across borders. ### Official Findings The **National Truth Commission (CNV)** investigated his case and confirmed his status as a victim of the dictatorship. The official determination holds the **Federal Government of Brazil** responsible for his death. This attribution is formally linked to the command structure of the era, specifically naming: * General Antônio da Silva Campos * General Ernesto Beckaman Geisel (President of Brazil from 1974 to 1979) * Octavio José de Almeida Goulart His case is formally documented with the CNV São Paulo ID `sidney-fix-marques-dos-santos`. ## References 1. [Source](http://comissaodaverdade.al.sp.gov.br/mortos-desaparecidos/sidney-fix-marques-dos-santos) 2. [Source](http://memoriasdaditadura.org.br/memorial/sidney-fix-marques-dos-santos/) 3. [Source](http://www.desaparecidospoliticos.org.br/pessoa.php?id=1563&m=3) 4. [Source](http://www.dhnet.org.br/dados/dossiers/dh/br/dossie64/br/dossmdp.pdfhttp://www.dhnet.org.br/dados/dossiers/dh/br/dossie64/br/dossmdp.pdf) 5. [Source](http://www.dhnet.org.br/dados/dossiers/dh/br/dossie64/br/dossmdp.pdf) 6. [Source](https://commons.wikimedia.org/w/index.php?title=File%3ARelat%C3%B3rio_da_CNV_3.pdf&page=1817) 7. [Source](http://www.desaparecidospoliticos.org.br/pessoa.php?id=1563) 8. [Source](https://oglobo.globo.com/brasil/comissao-da-verdade-confirma-investigacao-sobre-17-brasileiros-desaparecidos-no-exterior-7886139) 9. [Source](https://commons.wikimedia.org/w/index.php?title=File:Relat%C3%B3rio_da_CNV_3.pdf&page=1817)