An Act to provide for the detention, prosecution and punishment of persons for genocide, crimes against humanity, war crimes and other crimes under international law.
3 (2) The following acts or any of them are crimes within the jurisdiction of a Tribunal for which there shall be individual responsibility, namely:-
(a) Crimes against humanity: namely, ...other inhumane acts committed against any civilian population or persecutions on political, racial, ethnic or religious grounds, whether or not in violation of the domestic law of the country where perpetrated.
Persecution against any identifiable collectivity on other grounds universally recognised as impermissible under international law - crimes against humanity
Persecution against any identifiable group on political, racial, national, ethnic, cultural, religious, or gender grounds - crimes against humanity
EDIT.