The Regulations Governing Labor by Prisoners Article 7

Prisoners may be grouped according to their work nature, where the number of prisoners in the group shall be determined according to actual needs.
中文原文 受刑人作業實施辦法第7條
受刑人作業依其性質得採編組作業,各組人數依實際需要定之。

English translation for reference only; the Chinese text prevails. Not legal advice.