[1] Corrao also defended Graziano Verzotto who, according to Giuseppe Lo Bianco, was "the mysterious union man of Eni with the power’s darkest environments in Sicily, already existing at the time of its president’s assassination, in the affair of slush funds of Ente Minerario, deposited in Michele Sindona's banks".

[2] He started his political activity with the ACLI and the Christian Democracy; in 1955 he was elected as Deputy at ARS (Assemblea regionale siciliana), in the district of the province of Trapani for the list of DC.

In 1959 he was re-elected in the list of Social Christian Sicilian Union, both in the district of Trapani and Palermo, and he was appointed a regional minister once again, alongside Silvio Milazzo in the two subsequent governments, first for Public Works and later for Industry and Commerce.

After the end of Milazzismo, he approached to the Left; in 1963 he was elected a Member of Parliament at the Chamber of Deputies, as an independent in the list of PCI (Communist Party), in the Legislature IV of Italy, for the district of western Sicily.

His activity continued with the creation of Orestiadi di Gibellina in 1981 (a foundation since 1992, of which he was the president until death), and the Museo delle Trame Mediterranee, with the aim of realizing a dialogue among the different Mediterranean cultures.