Genghis Khan and the following Yuan emperors forbade Islamic practices like Halal butchering, forcing Mongol methods of butchering animals on Muslims, and other restrictive degrees continued. Muslims had to slaughter sheep in secret. Genghis Khan directly called Muslims and Jews "slaves", and demanded that they follow the Mongol method of eating rather than the halal method. Circumcision was also forbidden. Jews were also affected, and forbidden by the Mongols to eat Kosher. Toward the end, corruption and the persecution became so severe that Muslim Generals joined Han Chinese in rebelling against the Mongols. The Ming founder Zhu Yuanzhang had Muslim Generals like Lan Yu who rebelled against the Mongols and defeated them in combat. Some Muslim communities had the name in Chinese which meant "barracks" and also mean "thanks"; many Hui Muslims claim it is because that they played an important role in overthrowing the Mongols and it was named in thanks by the Han Chinese for assisting them.