When a leader turns on their own people it is a crime against humanity as defined by the Rome Statute.
Article 7(1):
“For the purpose of this Statute, ‘crime against humanity’ means any of the following acts when committed as part of a widespread or systematic attack directed against any civilian population, with knowledge of the attack:”
(a) Murder;
(b) Extermination;
(c) Enslavement;
(d) Deportation or forcible transfer of population;
(e) Imprisonment or other severe deprivation of physical liberty in violation of fundamental rules of international law;
(f) Torture;
(g) Rape, sexual slavery, enforced prostitution, forced pregnancy, enforced sterilization, or any other form of sexual violence of comparable gravity;
(h) Persecution against any identifiable group … on political, racial, national, ethnic, cultural, religious, gender … or other grounds that are universally recognized as impermissible under international law …;
(i) Enforced disappearance of persons;
(j) The crime of apartheid;
(k) Other inhumane acts of a similar character intentionally causing great suffering, or serious injury to body or to mental or physical health.”