Can i work legally on H1 pending status if my OPT expire?

You cannot work but you can remain in the U.S. pending adjudication. You may want to consider changing to premium to get a quicker response.

I asked my immigration lawyer for a copy of my file he says he will not give me copies because that is his work, can he do that?

You are entitled to a copy of your file and return of the originals but not his work product notes. Send the attorney a letter and if that is not...

When can I apply for the citizenship?

In most cases you can apply for citizenship 4 years and 9 months from the date of your permanent residency grant -- see your PR card for the...

I-485 Adjustment of Status Interview. I filled I-130 in FEB in CA and visa were available in SEP so filled I-485 chicago USCIS

I would assume the Officer will request the I-130 file and get the interview rescheduled but it won't hurt to call the 800# and check on this.

You can work with employer B as soon as the Petition filed by employer B is received by USCIS -- so send secure mail with proof of delivery. This...

no you do not have a 60 day extension. You are out of status the day of your denial unless your underlying status has time remaining. If you do...

What does the background check means?

Background check will look at your criminal and terrorist background in the U.S. or any other country where you may have been.

I will be getting my green card soon and had a few questions about the Social Security process.

If you are getting the green card you probably got a work card earlier. You can apply for the Social security number with the work card. It is...

H1B transfer after 6 years with I-140 approval

yes. Now that you have an approved I-140 with any employer you are entitled to unlimited 3 year H extensions.

Does transferring from one department to another department within same company on H1-B requires a H1-B new petition?

Maybe. You would need to evaluate the job descriptions of each as well as salary and other working conditions to determine if it is "material...