Twenty four Irish people including children have had their Australians visas cancelled.
They are facing deportation from Perth over a roofing scam.
A public warning was issued about the maintenance scam last week.
Police arrested several members of a group after it was alleged they had been posing as employees of a roof repair business to try to rob elderly residents.
Comlaints were made that the work was never completed.
A furthers 19 people were arrested after a search of a caravan park in Perth, and thousand of dollars recovered.
The group all had valid visas but were not allowed to work on them.
A total of 24 Irish people are now facing deportation following the operation.
