hēi​zhuān​yáo

illegal kiln

黑砖窑 (黑磚窯) hēi​zhuān​yáo
illegal kiln noun
An unlicensed or clandestine brick kiln operating outside of legal and safety regulations.
slave labor factory noun
Illegal production sites, primarily kilns, notorious for exploiting forced labor, particularly following the 2007 scandal in China.

Sources

Definitions
CC-CEDICT