Wow.
I've been in China a long time now.
This (or perhaps I should say these, since there seems to be an endless string of dodgy aliases) is easily by far the most hated and reviled name(s) in all of China.

It's not 2-3 bad white trash men. It's been years of stunned, anguished complaint from dozens, even hundreds of people.
I've seen a few alleged "testimonials" from alleged "English teachers" too...but I've never seen one written in good English. Most of them sound strangely like Frank's own dodgy English...

Recruiters in China are a pretty nasty barrel. And Frank Zhang (Allen Zhang, Alin Buuer, etc. etc. etc.) is at the very bottom sludgy layer of it. All I can say is...if you're goofy enough to have anything to do with this guy, you probably deserve whatever horror you end up in.

Don't go there.