Are The Immigration Service personnel can work Under cover ?

Yes

Is he bluffing? can he really do that?

Yes, he can do that.

Is your citizenship statues is a secret ?

No, it is not a secret.

What exactly is required for the Dream Act?

There is no dream act. For DACA you must submit evidence that you meet each of the...

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I-400 Naturalization Interview/Test : What to bring

the "as a spouse" language applies to those applying under the three year rule. You should retain an experienced immigration lawyer to review...

No

My wife wants a divorce and left the residence 2 months ago. She does have a green card that needs to be renewed next October.

Any one who is no a US citizen must report an address change within 10 days of moving.

How can I get my I-94?entered as minor in US in 2006 but was not given any legal doc & our passports were taken at entry

If one was issued, you can request a copy of filing form I-102.

Visitor visa for Wife/Spouse for H1B visa holder

Yes, if she is granted said visa.

Are some places in the states more safe than the others for non documented people?

Yes