Revolutionary Cells (German group)
The Revolutionary Cells (German: Revolutionäre Zellen, abbreviated RZ) were a self-described "urban guerrilla" organisation that was active between 1973 and 1995. The West German Interior Ministry described it as one of West Germany's most dangerous leftist terrorist groups in the early 1980s.
Source: Wikipedia — Revolutionary Cells (German group) (CC BY-SA 4.0)