Fraudulent manpower agencies

We all know that the UAE and some other countries are hiring workers from Bangladesh. A few days ago, a person I know, who completed his graduation from a reputed university, applied for a job in the UAE through a manpower agency. Interestingly, he got an SMS from BMET and went there to know about the agency, whether it was legal or not. But he got no information about the agency. He found the address of the agency on the internet and went to the address and found nothing but an under-construction building there. The people working there informed him that there was no such agency there. I suggest that those who want to go abroad should be very careful about the manpower agencies.