In early February 1979 the ruling Congolese Party of Labour (PCT) forced President Joachim Yhombi-Opango of the People's Republic of the Congo to resign, ending his nearly two-year rule after his opponents in the party accused him of rightist deviation and of marginalizing the party. Yhombi-Opango had become head of state in March 1977 after the assassination of President Marien Ngouabi. His tenure brought him into conflict with the PCT's dominant left-wing, which resented what it saw as his rightward drift and his sidelining of the party apparatus.
In early February 1979 an extraordinary party congress moved against him; he was forced to relinquish power, and the party turned to Colonel Denis Sassou Nguesso, whom Yhombi-Opango had earlier made first vice president of the PCT military committee. The dataset dates this forced resignation February 5, 1979 and codes the fate as not physically harmed; Yhombi-Opango was later placed under house arrest, expelled from the party, stripped of property and rank, and detained for years by Sassou Nguesso.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: President Joachim Yhombi-Opango, forced to resign in early February 1979 (dataset date February 5); he was not physically harmed at the removal, though he was later detained for years.
RESEARCHED NAME
Key figures
Joachim Yhombi-Opango (president forced to resign)
Denis Sassou Nguesso (who succeeded him)
The Congolese Party of Labour (PCT, which forced him out)
Sources
Following the assassination of Ngouabi in March 1977, Yhombi-Opango became Head of State and served for nearly two years until being forced to resign in February 1979, accused of attempting to form a rightist faction in the PCT, after which he was held in detention for several years by his successor, President Denis Sassou Nguesso.
SOURCE REVIEWEDWikipedia, Joachim Yhombi-Opangoopen source ↗
Ngouabi was assassinated in March 1977 and succeeded by Yhombi Opango, whose opponents in the PCT were angered by his rightist deviationism and perceived marginalization of the party and ousted him in a February 1979 coup, installing Denis Sassou Nguesso in power, marking a return to party orthodoxy.
SOURCE REVIEWEDWikipedia, Congolese Party of Labouropen source ↗
Sassou Nguesso's rival within the PCT, Joachim Yhombi-Opango, came to power after Ngouabi's 1977 assassination and appointed Sassou Nguesso first vice president of the PCT's military committee, and Yhombi-Opango was forced to resign in February 1979.
Marien Ngouabi was assassinated in 1977 and succeeded by Joachim Yhombi-Opango until he was overthrown in 1979, after which Denis Sassou Nguesso succeeded Yhombi-Opango and confirmed the PCT's rule with a new constitution.
SOURCE REVIEWEDWikipedia, People's Republic of the Congoopen source ↗
Editorial Note
Paired record care: this February 5 record is the forced resignation of Yhombi-Opango; the companion 1979-02-08 record is Sassou Nguesso's installation as provisional president days later, and the two are distinct dataset events (a special party congress confirmed Sassou Nguesso as head of state and party leader on March 31, 1979). Coding note: the dataset labels this a palace coup with a not-physically-harmed fate, accurately, as it was an internal PCT power struggle in which the sitting president was forced out without violence at the moment of removal. Later fate flagged: Yhombi-Opango was subsequently placed under house arrest, expelled from the PCT, had his property confiscated, was demoted from general to private, and was detained for years; this later treatment is recorded as flagged aftermath, not the fate of this February 1979 removal. Context: the change is described as a return to PCT left-wing orthodoxy after Yhombi-Opango's perceived rightist drift; the 1977 Ngouabi assassination is noted as documented background.
Cross-Reference
Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.
Identifiers for finding this same event in the other datasets:
Coup Atlas research identifies the target as: President Joachim Yhombi-Opango, forced to resign in early February 1979 (dataset date February 5); he was not physically harmed at the removal, though he was later detained for years..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; not physically harmed. The baseline file does not name individual targets; researched names are kept in a separate layer.
Baseline Dataset Citation
Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →