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:
(c) Slavery, as defined in article 159 of the Criminal Code;
shall be punished with a term of imprisonment of 12 to 25 years.
Enslavement - crimes against humanity
EDIT.