Chapter II
Crimes
Section I
Crime of genocide and crimes against humanity
Article 9
Crimes against humanity
Anyone who commits any of the following acts as part of a widespread or systematic attack directed against any civilian population:
(e) Imprisonment or other severe deprivation of a person’s physical liberty in violation of the norms or principles of international law;
shall be punished with a term of imprisonment of 12 to 25 years.
Imprisonment - crimes against humanity
Severe deprivation of physical liberty - crimes against humanity
EDIT.