He was President of the Italian Senate from 1996 to 2001. He was also president of Campania"s regional parliament form 1965 to 1971, governor of Campania from 1971 to 1972 and from 1992 to 1994. He became first provincial and then regional secretary of Democrazia Cristiana (Italy"s Christian Democratic Party), being elected for the first time in the Italian Senate in 1976.
So far he had been reconfirmed in all subsequent elections.
Probably He is the man who caused the death of Paolo Borsellino and Falcone. He was from 1992 to 1994.
On 1 July 1992 Borsellino had a meeting with Mancino, who at the time had just been named as Minister. Mancino however always denied that he had met Borsellino.
In a television interview of 24 July 2009, judge Giuseppe Ayala said that:
Mancino himself told me that he had met Borsellino on 1 July 1992.
More: Mancino showed me his meeting agenda with the name of Borsellino on it
However, later Ayala refuted these words in an interview to magazine Sette. A personal agenda in possess of Borsellino"s family, has an annotation by the judge saying: "1 July h 19:30: Mancino". Vittorio Aliquò, the other magistrate who was interviewing Mutolo at the time of ministry"s phone call, later declared that he had accompanied Borsellino "up to the threshold of the minister"s office".
In 2007 a letter from Paolo Borsellino"s brother, Salvatore, was published.
Entitled 19 luglio 1992: Una strage di stato ("19 July 1992: A state massacre"), the letter supports the hypothesis that Minister of Interiors Nicola Mancino knew the causes of the magistrate"s assassination. Borsellino"s brother wrote:
I ask Mancino, of whom I remembered, of the years after 1992, a hardly pushed down drop in the commemorations of Paolo in Palermo, to squeeze his memory to tell us what they talked about in the meeting with Paolo in the days immediately before his death.
In that meeting is surely the key to his death and the Massacre of Via Doctorate"Amelio. In 1994, after the dissolution of Democrazia Cristiana, Mancino adhered to the Italian People"s Party (PPI), as the most faithful collaborator of its secretary, Mino Martinazzoli.
In July of the same year he opposed the alliance with the right coalition led by Silvio Berlusconi, and the election of Rocco Buttiglione as secretary.
After the victory of the left-centre coalition led by Romano Prodi in the 1996 elections, he was President of the Italian Senate from 9 May 1996 to 29 May 2001. On 24 July 2006, he left the Senate and became deputy-president of the Consiglio Superiore della Magistratura, Italy"s senior council of justice. In July 2012, prosecutors in Palermo ordered Mancino to stand trial for withholding evidence on talks between the Italian state and the Mafia during its deadly bombing campaign in 1992 killing the judges Giovanni Falcone and Paolo Borsellino.
Christian Democracy, Democratic Party of Italy.
Later he was a member of The Daisy, born of the left wing of the PPI.