To what department do you complain about bank employees' participation in private lending?

The key depends on what kind of effect you want to achieve. If you just want to punish the bank staff, you can choose a lot. If you want to recover the loss, there are not many options.

(1) Complain directly to the branch or sub-branch of the bank employee to see if the problem can be solved. Usually, the bank wants to minimize the problem and may deal with the employee, but due to limited authority, it is unlikely to recover the loss.

(2) If bank leaders shield employees, they need to report the situation to their superiors. All banks are under the control of CBRC. You can go directly to the head office of the bank or even the CBRC. Under normal circumstances, the Head Office will not block individual employees, nor will the CBRC. The employee is likely to be dealt with, but it is uncertain whether the loss can be recovered.

(3) To sue employees and banks in court. If the evidence is complete, this is the most likely way to recover the loss, but it may not be possible and it will take a long time.

It is very difficult for the employee to participate in private lending, and the evidence must be very complete. It is not enough to rely solely on oral evidence.