In ancient China, were there any organizations similar to fantasy novel's trade unions that were rewarded after completing their tasks, or were they unscrupulous and black and white? There better be.
There should be a killer organization, but the name has not been passed down. In ancient China, so-called able men and chivalrous men prevailed, such as the famous assassins Nie Zheng and Zhuan Xu. Generally, only the royal family or powerful nobles will train killers in an organized way, such as the East Factory in the Ming Dynasty and the stickers in the Qing Dynasty. Because centralization of authority, a powerful city in ancient China, even if there are people of this type, they dare not say anything. I don't know if this rebel group Bai Lianhua or Zoroastrianism counts.