回复：回复：回复：FBI 官方标准回信。他们总是说"as quickly as possible".

--- I am in NJ. Is it a state favorable to file a WOM?
yes, you are luck to residue there, see here

--- Who should I sue? USCIS or FBI, or both?
both

--- My case was transferred to taxes center from Vermont center this March. Should I sue the directors of both centers?

TSC director, since they are in charge of your case now