Logistic support and training were carried out directly by the Czechoslovak StB both in Prague and at remote PLO training camps in North Africa and Syria.
Med Negrijem in Rdečimi brigadami nikoli ni bila dokazana nobena povezava, skoraj vse obtožbe proti njemu (vključno 17 umorov) so zaradi pomanjkanja dokazov padle v nekaj mesecih njegovega zapora.