The Bronx District, one of the main gathering places for Italians in the United States, was also the stronghold of the Italian Independence Organization.
Compared to other revolutionary groups, the Italian Independence Organization was indeed bustling. They originally had a leader, and the Carbonari, the most influential revolutionary group, was the main force with influence spread across the entire Italian area.
Following the outbreak of the regicide, the Carbonari suddenly became the most notorious terrorist organization internationally, and as a consequence, the Kingdom of Sardinia, seen as a land of hope, collapsed as well.
The Italian revolutionary groups also fractured, and originally allowing the Carbonari to take the lead was because of their large influence and wide reach, not because everyone was actually obedient to them.