Question: Who formed the rival group to the Argentinian group founded by a President of Argentina overthrown in a "coup d'état"?
Sentence (from "1963 Togolese coup d'état"): While the government of Ghana and its President Kwame Nkrumah were implicated in the coup and assassination of Olympio, full investigation was never completed and the international outcry eventually died down.
Relevant evidence: No