Piano Solo was an envisaged plot for an Italian coup in 1964, planned by then director of the military police

Carabinieri

The Carabinieri is the national gendarmerie of Italy, policing both military and civilian populations, and is a branch of the armed forces.-Early history:...

, Giovanni De Lorenzo.

The coup plans were investigated in 1967, when the journalist Eugenio Scalfari

Eugenio Scalfari

Eugenio Scalfari is an Italian journalist, editor of the news magazine L'espresso , former member of parliament in the Italian Chamber of Deputies , co-founder of the newspaper La Repubblica and its editor from 1976 to 1996.-Biography:A law graduate with a interest in journalism and politics,...

 and Lino Jannuzzi uncovered the attempt in the Italian news magazine L'Espresso

L'Espresso

l'Espresso is an Italian newsmagazine. It is one of the two most prominent Italian weeklies, the other being Panorama. Since the latter has been acquired by right-wing tycoon and politician Silvio Berlusconi, l'Espresso enjoys the reputation of being the main politically independent newsmagazine...

in May 1967. However, the results of the official investigation remained classified until the early 1990s. It was released by premier Giulio Andreotti

Giulio Andreotti

Giulio Andreotti is an Italian politician of the now dissolved centrist Christian Democracy party. He served as the 42nd Prime Minister of Italy from 1972 to 1973, from 1976 to 1979 and from 1989 to 1992. He also served as Minister of the Interior , Defense Minister and Foreign Minister and he...

 to the parliamentary investigation into Operation Gladio

Operation Gladio

Operation Gladio is the codename for a clandestine NATO "stay-behind" operation in Italy after World War II. Its purpose was to continue anti-communist actions in the event of a shift to a Communist party led government...

. L'Espresso mentioned that some 20,000 Carabinieri were supposed to deployed around the country, with 5,000 of them taking over Rome, including publishing outlets and the Communist headquarters

Italian Communist Party

The Italian Communist Party was a communist political party in Italy.The PCI was founded as Communist Party of Italy on 21 January 1921 in Livorno, by seceding from the Italian Socialist Party . Amadeo Bordiga and Antonio Gramsci led the split. Outlawed during the Fascist regime, the party played...

.

The Financial Times

Financial Times

The Financial Times is an international business newspaper. It is a morning daily newspaper published in London and printed in 24 cities around the world. Its primary rival is the Wall Street Journal, published in New York City....

posed the possibility that the paper coup was simply used as a way to sway coalition talks between the Christian Democrats

Christian Democracy (Italy)

Christian Democracy was a Christian democratic party in Italy. It was founded in 1943 as the ideological successor of the historical Italian People's Party, which had the same symbol, a crossed shield ....

 and Socialists

Italian Socialist Party

The Italian Socialist Party was a socialist and later social-democratic political party in Italy founded in Genoa in 1892.Once the dominant leftist party in Italy, it was eclipsed in status by the Italian Communist Party following World War II...

. President Antonio Segni

Antonio Segni

Antonio Segni was an Italian politician who was the 35th Prime Minister of Italy , and the fourth President of the Italian Republic from 1962 to 1964...

 was apparently running out of patience with the demands from Pietro Nenni

Pietro Nenni

Pietro Sandro Nenni was an Italian socialist politician, the national secretary of the Italian Socialist Party and lifetime Senator since 1970. He was a recipient of the Stalin Peace Prize in 1951...

.