Marco Mancini was the second-highest-ranking officer of SISMI, the military intelligence agency of Italy  until his 5 July 2006 arrest for his participation in the kidnapping of Hassan Mustafa Osama Nasr (the Imam Rapito case). He was then indicted a second time on December 13, 2006, for his role in the SISMI-Telecom scandal. On February 12, 2013, he was sentenced to a 9-year jail term by the Milano Court of Appeals.
The investigations directed by Milan's public prosecutor, Armando Spataro, have demonstrated that Mancini proposed himself to the CIA as a "double agent."  According to Colonel Stefano D'Ambrosio's testimony to the Italian justice, the CIA refused because they considered him too "venal." But his demand "left traces in the computer" of the US intelligence.
All SISMI testimonies concur in saying that Mancini owed his dazzling career (he was a non-commissioned officer) to his "privileged relations with the CIA." According to SISMI testimony, after the 17 February 2003 kidnapping of the Hassan Mustafa Nasr, then CIA director George Tenet sent a letter to SISMI General Nicolò Pollari in August 2003, to which he would owe, according to SISMI testimony, the real reasons of his promotion.
- Allesandro Mantovani, reporter at Il Manifesto, "Du riffifi dans les services secrets[permanent dead link], L'Humanité, August 12, 2006 (in French)
- Wilkinson, T. (2006). "Italian Probe Broadens Beyond Abduction: Prosecutors in the case of a Muslim cleric seek evidence of illegal spying by intelligence officers. Some journalists also may be involved." The Los Angeles Times, July 7, 2006
- Stewart, Phil and Massimiliano Di Giorgio. Italian spies arrested, Americans sought for kidnap[permanent dead link], Reuters. 5 July 2006.
- "Da Telecom dossier sui Ds" Mancini parla dei politici, La Repubblica, 26 January 2007 (in Italian)
- Inchiesta Telecom, Mancini arrestato per i dossier e le intercettazioni illegali, La Repubblica, 12 December 2006 (in Italian)
- "Italian ex-spy chief gets 10 years in CIA case". Reuters. February 12, 2013.
- BBC News Italians held over 'CIA kidnap', 5 July 2006
- Paolo Biondani and Guido Olimpio. 11 July 2006 Corriere della Sera, "Un centro segreto Cia-Sismi" available here (in Italian)