He held various high-ranking offices within the National Fascist Party during the interwar period, and during the Italian Social Republic he served as prefect of Genoa and Undersecretary for the Armed Forces.

In August 1916 he was awarded a Bronze Medal of Military Valor for an having led a bayonet attack on an Austro-Hungarian patrol, killing or capturing its members, on the Isonzo front.

Basile aimed to implement welfare programs in favor of the working class, in order to gain the favour of the masses towards the regime; at the same time, he was a representative of the "monarchist" wing of the Fascist Party, pursuing good relationships with the House of Savoy.

Guido Buffarini Guidi offered him the prefecture of Genoa, but Basile hesitated, stating that he would have preferred another destination; he finally accepted at the insistence of Mussolini, who invited him to Gargnano for a personal meeting.

Basile responded to the strikes by ordering the lockdown of the factories for a week, and retaliated to the GAP attack by summoning a Special Military Tribunal which sentenced eight political prisoners to execution by firing squad, carried out at Fort San Martino.

[22] Despite these threats, the strikes did not cease; on 19 May Basile, protected by an escort, personally toured the factories to talk to the workers, declaring that he understood them, that they had good reasons to protest, but that they had to realize that the moment was very difficult.

On 28 June, as had been decided during a meeting of the Council of Ministers held two months before, Basile was replaced at the head of the province of Genoa by the commissioner Arturo Bigoni; on the same day, he was appointed by Mussolini as Undersecretary to the Armed Forces, with the rank of colonel.

[34] According to Basile’s later accounts, the execution did not take place immediately due to his physical condition (the partisans had shot him in the groin during his capture) and the late hour, and was therefore postponed to the morning.

[35][36] Basile, like other prominent members of the regime, was put on trial for the crime of collaboration with the Germans, in particular for having provided "help and assistance as head of the province of Genoa first and then as undersecretary of war".

Basile was also accused of the death of eleven political prisoners, sentenced to be shot by the Special Military Tribunal, which he had summoned three times in response to attacks carried out by the GAP.

[41][42] A few days later, under the pressure of popular protests that broke out in Genoa, the prosecutor of that city issued a new arrest warrant against him, placing him on trial for the crimes of complicity in the murder of eleven partisans and collaborationism.

He also continued his writing career, publishing in 1958 the novel Le mie quattro amiche (My Four Friends), inspired by a 14-day trip he had made with his wife in 1922, from Stresa to Venice, on a barge called chiocciola (snail), which he had personally designed.