child labor
US /ˈtʃaɪld ˌleɪ.bər/
UK /ˈtʃaɪld ˌleɪ.bər/

1.
the use of children in industry or business, especially when illegal or considered inhumane.
:
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Many organizations are fighting against child labor in developing countries.
•
Laws have been enacted to prevent child labor.