forced labour
noun /ˌfɔːst ˈleɪbə(r)/
  /ˌfɔːrst ˈleɪbər/
(US English forced labor)
 [uncountable]- hard physical work that somebody, often a prisoner or slave, is forced to do
 - prisoners or slaves who are forced to work
- The mines were manned by forced labour from conquered countries.