The United States welcomes thousands of foreign workers in multiple occupations or employment categories every year. These include artists, researchers, cultural exchange participants, information technology specialists, religious workers, investors, scientists, athletes, nurses, agricultural workers and others. All foreign workers must obtain permission to work legally in the United States. Each employment category for admission has different requirements, conditions and authorized periods of stay. It is important that you adhere to the terms of your application or petition for admission and visa. Any violation can result in removal or denial of re-entry into the United States.