The Revolutionary Cells (German: Revolutionäre Zellen, abbreviated RZ) were a self-described "urban guerilla" organisation, that was active between 1973 and 1995,[1] and was described in the early 1980s as one of Germany's most dangerous leftist terrorist groups by the West German Interior Ministry.[2] According to the office of the German Federal Prosecutor, the Revolutionary Cells claimed responsibility for 186 attacks, of which 40 were committed in West Berlin.[citation needed][3]