Red Butterfly, the Four Gates of Southeast, Northwest, East, and South, have each set up their bases in the regions they control.
For ease of management, Zhu Fan will undoubtedly want to control all economic power,
and the strength of those four Sect Leaders is formidable—surely they were selected from elite ranks. The use of nerve toxins guarantees Red Butterfly's firm control over all personnel.
Initially, Zuimo wasn't controlled by the nerve toxins, which might be due to his outstanding performance afterwards, earning him the real antidote to eliminate the toxin.
After returning to XG, Xiaofan and the team members each received a member handbook, documenting the membership grades of the Assassin Network and some untouchable regulations. The rewards and penalties were clearly written.