What is the name of the killer organization in the setting of urban novels?

Similar organizations can also be called Canyun Gang, Yu Yan Tomb, Banhua, Ma Nuoluo and Bloody Killing.

Name of domineering killer organization: Biloch, a Russian killer organization, is good at cruel killing, and the killing process is very cruel and bloody. The lone wolf, a killer organization in a country in West Asia, is an old enemy with the Red Sun organization. Mafia-in Italy, organizers are numerous and easy to find, and they can get away at any time after killing, and the means are clean and neat. Takeda Co., Ltd., a mysterious organization in Japan, the killers are all Japanese samurai with good skills. They are masked and secretive, which has a great influence in Japan and is frightening.