
The role of Immigration officers are to ensure that immigration legislation is enforced. This can cover the rules of entry for Visa (document) applicants, foreign nationals or those seeking asylum at the border, detecting and apprehending those that have breached the border and removing them, or pursuing those in breach of immigration and criminal...
Found on
http://en.wikipedia.org/wiki/Immigration_officer

Any employee or class of employees of the Service or of the United States designated by the Attorney General, individually or by regulation, to perform the functions of an immigration officer specified by this chapter or any section of this title. 8 USC
Found on
http://www.lectlaw.com/def/i008.htm

Officials dealing with immigration at UK ports and with enforcement (criminal offences connected with immigration law, removal and deportation).
Found on
https://www.encyclo.co.uk/local/20918
No exact match found.