Cospito and the other suspects face charges of incitement to commit crimes, including for the purposes of terrorism as an aggravating factor, and subversion of the democratic order in relation to publication of an interview published by the anarchist magazine Vetriolo.
Cospito has been on a hunger strike since October to protest against the tough 41 bis prison regime that he is being held under in relation to separate convictions for a bomb attack on a Carabinieri police training academy in Piedmont in 2006 and for a kneecapping attack in 2012.
The 55-year-old, who is serving more than 30 years in total for his crimes, has asked for his prison sentence to be commuted to house arrest on health grounds amid concerns about his deteriorating medical condition.
In related news, a masked gang of eight caused a firecracker explosion and briefly unfurled banners supporting Cospito outside the Italian Consulate in New York on Tuesday.
Locals in Turin walk past graffiti that reads "You will pay dearly, free Alberto". (Photo: AAP)
No-one was hurt and no damage was done by the explosion, Italian foreign ministry sources said.
Cospito's supporters have embarked on a wave of threats, acts of vandalism and violent protests, including rioting in Turin in early March.
ANSA
