In December 1792, Giordano was one of the scholars who met the French admiral Latouche-Tréville; starting from those meetings, a conspiracy began, sketched in the birth in August 1793 of the Società Patriottica Napoletana, a Jacobin association, but structured on the model of Masonic lodges, with a hierarchy such that some secrets were known only by high-ranking members.
The LOMO (acronym for "Libertà o Morte", i.e. "Freedom or Death"), was more moderate and willing to accept a constitutional monarchy, and was led by Rocco Lentini, and joined by Annibale Giordano).
Many sources state that Annibale Giordano told investigators the secrets of the Società Patriottica Napoletana[5] and that he gave the names of over 250 members,[6] including Luigi de' Medici, who was incarcerated.
[7] Back in Naples together with the general Championnet on 5 December 1798, a few days after being released from L'Aquila, Annibale Giordano actively joined the short-lived Neapolitan Republic of 1799 as a member of the military committee and then head of the Navy's accounting service.
When the Republic fell (in June 1799), he was again imprisoned by the Bourbon king in Castel Nuovo together with eighteen other revolutionaries including Mario Pagano, Domenico Cirillo and Giuseppe Leonardo Albanese [it].