1. (noun) a clandestine group of leftist extremists who oppose Italy's labor policies and foreign policy; responsible for bombing building in the historic center of Rome from 2000 to 2002

• revolutionary proletarian initiative nuclei
• revolutionary proletarian nucleus

1. (noun) a clandestine group of leftist extremists who oppose Italy's labor policies and foreign policy; responsible for bombing building in the historic center of Rome from 2000 to 2002

• act of terrorism
• terrorism
• terrorist act