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Noun: Revolutionary Proletarian Nucleus
  1. A clandestine group of leftist extremists who oppose Italy's labour policies and foreign policy; responsible for bombing building in the historic centre of Rome from 2000 to 2002
    - Revolutionary Proletarian Initiative Nuclei, NIPR

Type of: foreign terrorist organisation [Brit], foreign terrorist organization, FTO, terrorist group, terrorist organisation [Brit], terrorist organization