A perfect source of low labour workers, such as janitors, waiters, taxi drivers, etc., that consists of highly educated workforce (masters and PhDs) who used to have good careers in their own country.
Pros: They are resistant to abuse and unpaid wages and they never complain. Companies love them because they can lower costs and increase their profit margins.
Cons: They don't speak English, and even though they do, they still don't have "Canadian Experience".
Why take such a low paying job? You act like one of those Canadian Immigrants!