[1] He returned to his legal practice as the war ended, but decided to follow the paramilitary movement of Gabriele D'Annunzio, as it attempted to seize the "unredeemed" and disputed port of Fiume (today Rijeka).

[4] D'Annunzio gave Giuriati command of the Carnaro legion in Zara and, in February 1920, sent him to Paris in a vain attempt to be admitted at the peace conference, as a representative of the military government of Fiume.

Nonetheless, Giuriati briefly served as provisional President of the territory after a coup d'état against the government of the Free State of Fiume in March 1922.

In 1943, he joined the condemnation of Italy's participation in the Axis, agreeing to the coup carried out by Dino Grandi inside the Grand Council of Fascism.

The Italian Social Republic, a Fascist state recreated by Nazi Germany in Northern Italy, engineered the in absentia Verona trial against Grandi and his pro-Allies collaborators, during which Giuriati was sentenced to death.