There are various ways to trick people who wish to obtain a work visa, because they long for stability and better job conditions.
It is very important to be careful, because on the Internet there are many unreliable websites that offer work visas in the U.S. 
As a matter of fact, many people, eager to get the Green Card, have come to pay large amounts of money, and have ended up b
eing victims of scams.
The person who wants to get a permit in the U.S. must always be aware of where this information is posted.
For example, a U.S. Embassy website is a reliable source. Other websites are risky.
Besides the Internet, there are other ways of committing fraud. Mexican professional boxer, Saul ‘Canelo’ Alvarez, is currently facing a trial in the United States where an issue about a visa that is only delivered to people with specific talents has come to light.
The athlete is accused for allegedly breaching a contract of employment with his former representative: All Star Boxing. Alvarez said that when he signed the contract, he actually thought that he was signing a document to obtain a visa.
SB Nation argues that the company did file a P visa (type 1), which is a permit that allows people to work in the U.S.