Even if Zhang is an influential perspon to some extent - this would not make me "tremble" in "fear" of him. He cannot do anything except bribing, raping, cheating, lying, and posting under fake nanes, etc.
The only way is to speak up against him and see that he hopefilly will be out of business soon!

Someone else called Zhang "the king of Chinese whoremasters".
Now, if he is then perhaps he is recruiting Chinese whores these days for corrupt Chinese bosses and certain foreign sex tourists.
After all, a recruiter is a recruiter, right?