Coup Atlas Research Database
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48408141978ConspiracyDissident coup

Congo, 1978 — dissident coup conspiracy

Congo (COG)Central Africa, AfricaAugust 14, 1978

Event Summary

This entry is coded 14 August 1978, during the unstable interregnum under General Joachim Yhombi-Opango, head of state of the People's Republic of the Congo, the Marxist-Leninist one-party state in Brazzaville. Yhombi-Opango, associated with the right wing of the ruling Congolese Labour Party, had become head of state after the assassination of President Marien Ngouabi in March 1977, and his roughly two-year rule was marked by factional infighting within the party and military, renewed purges of suspected dissidents, and a protracted power vacuum, with northern loyalists maneuvering against perceived rivals. He was accused of attempting to form a rightist faction in the party, and was forced to resign in February 1979 under pressure from the PCT Central Committee, when Denis Sassou Nguesso, the defense minister who had controlled the security apparatus since 1974, formed a military committee to oust him.

The August 1978 coding sits in this period of factional plotting within the party and military as tensions built toward Yhombi-Opango's fall.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: Yhombi-Opango was forced to resign in February 1979 and detained; Sassou Nguesso succeeded him
RESEARCHED NAME
Key figures
General Joachim Yhombi-Opango (head of state, target)
Denis Sassou Nguesso (defense minister and rival)
Congolese Labour Party factions

Sources

Yhombi-Opango became head of state after Ngouabi's assassination in March 1977, presided over a period of factional infighting and renewed purges, and was accused of attempting to form a rightist faction in the PCT.
SOURCE REVIEWED Wikipedia: Joachim Yhombi-Opango open source ↗
His two-year interregnum was characterized by factional infighting, renewed purges of suspected dissidents, and economic stagnation, culminating in his resignation in February 1979 under pressure from the PCT Central Committee.
SOURCE REVIEWED Grokipedia: People's Republic of the Congo open source ↗
On 5 February 1979, Denis Sassou Nguesso, the defense minister aligned with the PCT's radical wing, formed a military committee to oust Yhombi-Opango, compelling him to transfer authority to the PCT Central Committee.
SOURCE REVIEWED Grokipedia: People's Republic of the Congo open source ↗
Accused of attempting to form a rightist faction in the PCT, Yhombi-Opango was forced to resign in February 1979 and was subsequently held in detention for several years by his successor Sassou Nguesso.
SOURCE REVIEWED Wikipedia: Joachim Yhombi-Opango open source ↗

Editorial Note

No discrete plot is precisely dated 14 Aug 1978 in the sources located this session; the coding sits in the Yhombi-Opango interregnum of factional plotting and purges within the PCT and military, before his February 1979 ouster by Sassou Nguesso. Context with strong framing. First Congo record in the run.

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:

Cline Center id
48408141978

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: Yhombi-Opango was forced to resign in February 1979 and detained; Sassou Nguesso succeeded him.

Baseline coding: Plot discovered and disrupted before execution. Recorded leader fate: remained in office; 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 citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

CSP

Named in the baseline source document; no article citation was recorded.

LA Times

“Attempted Coup Foiled, Congo Leader Announces,” August 14, 1978

The Guardian

“Congolese crush anniversary coup,” August 15, 1978

Globe and Mail

“Congo says coup plot foiled, four arrested,” August 15, 1978

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 →

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