Leonetto Amadei (Seravezza, 7 August 1911 – Marina di Pietrasanta, 10 November 1997) was an Italian lawyer and a politician.

Subsequently Amadei was elected deputy in the district of Lucca, Livorno, Pisa and Massa Carrara, again for the Italian Socialist Party, and he also held the post of Secretary to the Ministry of Justice in the first Rumor Government.

"Specifically, according to Giovanni Flora, professor of criminal law at the University of Ferrara, the Court sanctioned the vagueness of the wording of the criminal case, "citing the fact of impossibility of verify essentially covered by the present case, however, the impossibility of its assessment with logical-rational criteria, the intolerable risk of arbitrators of the judicial body.

"[3] There is the common- sense recognition that some people, especially those who are suggestible, can be manipulated and exploited to a high degree.

In Italy the Court declared plagio unconstitutional found the concept to be imprecise, lacking coherence, and liable to arbitrary application (1981)[4] After few years the President Amadei took part at the scientific conference "Persuasion socially accepted, plagiarism and brainwashed", organized by Mario Di Fiorino, in Forte dei Marmi, in 1989, to discuss the new situation.