Question: Who was the first Mafia boss to turn informant ("pentito") and explain the inner workings of the organisation, who told  that Geraci took care of the fugitive Riina while he stayed in Partinico?
Sentence (from "Nenè Geraci"): Geraci sat on the Sicilian Mafia Commission since the mid-1970s and belonged to the hard line faction allied with the Corleonesi of Totò Riina and Bernardo Provenzano.
Relevant evidence: No