I'm US Citizen and planning to apply for immigrant visa for my sister .....

You may file I-130 now for your sister, listing her husband and child as derivatives but will have to wait for her priority date to be current...

How about working on-campus and off-campus on F1 Visa?

You are allowed to work during your first academic year on F-1 but need to obtain employment authorization to do so.

Does the gov't hold the USCIS or ICE to prove marriage fraud for green card even in a waiver case?

On an I-751 waiver, it is the conditional resident's burden to show that the marriage was bona fide. There is a difference between fraud and...

Possibility of Immigration Officer (IO) rejecting my entry to US because I extended my stay for 1-week on my previous trip to US

As long as you can show that you don't have an intention to stay, you shouldn't have a problem. You should carry with you a letter from our company...

My fiancé is an illegal immigrant whose tourist visa expired and we want to get married soon. How do we go about doing this?

If you are an American citizen and marry your fiancé, you can file a petition for him and, since he entered the country legally,even if he is not...

I received approval letter July 18 it said wait 30 days till I receive a letter from nvc I haven't received anything

You should wait a little longer, it hasn't even been one week over the thirty days. You should be receiving your package very soon.

The clock was probably stopped when you missed your biometrics appointment and should have been restarted when you had them done. This means that...

SOCIAL SECURITY GREEN CARD QUESTION

Indicate that you lost the card and do not remember the number.

When can an asylum seeker apply for an Employment Authorization Doc.? (after 150 or 180 days?)

Agree with both colleagues, wait to file at 180 days of inaction on the application.

K1 or spousal visa

If beneficiary qualifies, K-1 Fiance visa is generally faster. The visa will be good for 90 days, during which time you are expected to get married...