It's alleged more than 100 (132) cases of suspected corrupt activity by Australian immigration officials have been referred to the Australian Commission for Law Enforcement Integrity in the past 12 months.
A joint investigation by Fairfax and the A-B-C claims rorting of the sector has also involved migration agents, employers who sponsor workers, and education providers.
Opposition leader Bill Shorten says if the allegations are confirmed, it shows the coalition government has lost control of the visa system.
Prime Minister Malcolm Turnbull is promising to take allegations of visa fraud within the Immigration Department with the utmost seriousness.
