U. S. work visas are issued to non-citizens who wish to work in the United States. There are two types of work visas: immigrant and non-immigrant. Immigrant visas are issued to workers who are legally in the United States, and are classified as either "E" or "EB," depending on whether the worker has already applied for permanent residence. Non-immigrant visas include temporary visas for athletes and artists (P visa), religious workers (R), medical personnel (H1-C), speciality occupations (H1-B) and foreign media (I).
Lying or Falsifying Documents
If you give false information in your application, you can lose your work visa. The U.S. Citizenship and Immigration Service (USCIS) or the Department of State can revoke your visa if they find that you falsified your documentation to obtain the visa.
Compliance at the Port of Entry
A visa gives you permission to enter the United States for a certain amount of time for a specific purpose; in this case the purpose is to work. However, being granted a visa does not guarantee entry into the United States. At the U.S. port of entry, you are required to meet with an immigration officer, who will have the final say on whether you will be allowed to enter the country. If, for any reason, the immigration officer feels that you are not being compliant, you do not have the appropriate documentation or that you are acting suspiciously, he has the right to detain you prior to your entry into the United States. Being detained can mean simply answering a few more questions, or it can result in your work visa being revoked.
Some work visas are nontransferable. This means that you are only allowed to work for a specific employer in the United States. If you start working for another employer (in addition to or instead of your original employer), your work visa can be revoked.
If you are found to engage in any criminal activity, you will lose your visa. This can also result in fines, imprisonment and deportation from the United States. This is not exclusive to a work visa: any visa holder found guilty of a crime will be forced to leave the United States.