Salt Owl - Enkyo

Japanese: 塩梟 - えんきょう

...A group of Chinese salt smugglers. They are also called salt smugglers or salt bandits. During the Tang Dynasty, from the second half of the 8th century onwards, Exclusive Once the system was implemented, and especially during the Song Dynasty when a detailed system with severe penalties was established, the people were generally forced to use expensive, inferior salt.

From [Pirates]

…From the end of the Qing Dynasty through the Republican period, pirates often appeared on the seas of southern China. In addition, there were pirates called "enkyo" who smuggled salt in the lower reaches of the Huai River, and river bandits appeared on the Yangtze River. For more information on Japanese "pirates," see the entries for "naval forces" and "pirates."

*Some of the terminology explanations that mention "Shio Fukuro" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…中国，塩の密売者の集団。塩梟（えんきよう），塩賊などとも呼ばれる。唐代，8世紀の後半以後，塩の専売制が実施され，とくに宋代になって厳重な刑罰をともなって精密な制度ができあがると，民衆は概して高価で粗悪な塩を強制されることになる。…