If you're going to play in the space of bigotry and xenophobia, it's best to come prepared. At a media conference yesterday, Immigration Minister Brendan O'Connor struggled to explain exactly how the 457 visa category was being rorted. He offered a couple of anecdotes, and said there'd been over 100 sanctions under the program.
That's a program that currently sees around 100,000 visa holders at any one time. Even the numerically challenged can see that's one case in a thousand, and probably far less, assuming O'Connor was using a total rather than an annual figure.