The factory is being investigated by international organizations for operating sweatshops.

sweatshops 是复合名词，由 sweat（汗水）和 shop（工厂、车间）组成。sweat 在这里比喻工人辛苦劳动流下的汗水，shop 指工作场所。sweatshop 指工作条件恶劣、工资极低的工厂，中文常译为"血汗工厂"。