Re Zaire you must read "King Leopold's Ghost" by Adam Hochschild (1998). Belgian colonialism was the most brutal and barbaric of any European nation. Should be available on Amazon.
For info on the Cental African Republic (formerly the Central African Empire) you
need to watch the Werner Herzog documentary (circa 1990 -showing my age here)
It's entitled "Echoes From a Sombre Empire" "Echoes aus einem duesteren Reich"
in German. Well worth a watch. Ceaucescu gave a Romanian ballet dancer to Bokassa on a state visit.
As to what was in his freezer I shudder to think.