Convention pour la prévention et la répression du crime de génocide
John B. Quigley in "The Genocide Convention: An International Law Analysis" points out that at Macías Nguema's trial for genocide that Equatorial Guinea had not ratified the Genocide convention and that records of the court proceedings show that there was some confusion over whether Nguema and his co-defendants were tried under the laws of Spain (the former colonial power), or whether the trial was justified on the claim that the Genocide Convention was part of customary international law. Quigley states that "The Macias case stands out as the most confusing of domestic genocide prosecutions from the standpoint of the applicable law. The Macias conviction is also problematic from the standpoint of the identity of the protected group."