From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Unfree_labour

Unfree labour is a generic or collective term for those work relations, especially in modern or early modern history, in which people are employed against their will with the threat of destitution, detention, violence (including death), compulsion, or other forms of extreme hardship to themselves or members of their families.

Unfree labour includes all forms of slavery, and related institutions (e.g. debt slavery, serfdom, corvée and labour camps). Many of these forms of work may be covered by the term forced labour, which is defined by the International Labour Organization (ILO) as all involuntary work or service exacted under the menace of a penalty.

However, under the ILO Forced Labour Convention of 1930, the term forced or compulsory labour shall not include:

Payment for unfree labour