- April 1980 — Bakolori Massacre (technically Sokoto State, but the affected farmers are Kebbi-Sokoto Kebbawa peasants displaced by the Bakolori Irrigation Project; 380+ killed by Nigerian Mobile Police when farmers resist the dam's land seizure). The single largest peasant massacre in Nigerian Fourth Republic prehistory.
Kebbi State · Crisis deep dive
Military era (1970–1999)
Methodology
Tier 1 · primary
Courts. Gazettes. National archives.
Tier 2 · corroborating
OCCRP. HRW. BudgIT. TheCable.
Tier 4 · tertiary, flagged
Wikipedia only where primary is pending. Always labelled.