Red Army Faction in November of that year, the Federal Constitutional Court (Bundesverfassungsgericht) demanded that they return to custody. Only Horst Söhnlein complied with the order; the rest went underground and made their way to France, where they stayed for a time in a house owned by prominent French journalist and revolutionary, Régis Debray, famous for his friendship with Che Guevara and the "foco" theory of guerrilla warfare. Eventually they made their way to Italy, where the lawyer Mahler visited them and encouraged them to return to Germany with him to form an underground guerrilla group. The Red Army Faction was formed with
Revolutionary Cells (German group) Revolutionary Cells (German group) The Revolutionary Cells (, abbreviated RZ) were a self-described "urban guerilla" organisation, that was active between 1973 and 1995, and was described in the early 1980s as one of Germany's most dangerous leftist terrorist groups by the West German Interior Ministry. 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. The Revolutionary Cells are perhaps known for hijacking an Air France flight in cooperation with the Popular Front for the Liberation of Palestine – External Operations (PFLP-EO) and diverting it