The purpose and effect of the thirteenth

amendment was to

The first of three Reconstruction Amendments after the Civil War; it was passed in 1865 in order to permanently and irreversibly ban and forbid slavery in the territory of the United States except when used to punish a criminal offense irrespective of the offender's race.

It applies to the actions of private citizens and is currently used to forbid and prevent sex-trafficking and/or any kind of slavery or indentured servitude.