Revolutionary Nuclei (RN, Greek: Επαναστατικοί Πυρήνες; Epanastatiki Pyrines), also known as Revolutionary Cells, is a far-left terrorist group in Greece. RN first appeared with a bomb attack on a Hellenic Coast Guard facility in Piraeus on 11 May 1997. In a proclamation sent to Eleftherotypia newspaper but never published, the group denounced workplace accidents in the Piraeus port ship construction zone and pledged to "strike without mercy the people responsible for those deaths" and that of anarchist Christoforos Marinos (found dead in his cabin aboard the ferryboat Pegasus, an apparent suicide, as port police closed in to arrest him on 23 July 1996).