Hans-Joachim Klein ( born 1947 ) is a former member of the German left-wing militant group Revolutionary Cells ( RZ ) . His '' nom de guerre '' was " Angie " . In 1975 , Klein participated in an attack on OPEC headquarters in Vienna organized by the international terrorist " Carlos the Jackal " , in which he was seriously injured . He publicly renounced political violence two years later . After decades in hiding , he was arrested in 1998 , prosecuted for his role in the OPEC attack , and sentenced to nine years ' imprisonment . He was paroled in 2003
attack on OPEC headquarters
OPEC siege
Hans-Joachim Klein