The use of unpaid interns in the US has long boggled my mind - I just could not conceive of this being legal. But that does beg the question: In what jurisdict

The use of unpaid interns in the US has long boggled my mind - I just could not conceive of this being legal. But that does beg the question: In what jurisdictions is it legal to employ unpaid workers, and under what circumstances? My knee-jerk naive judgment would be that it is always illegal in my jurisdictions of greatest interest (Ontario, Canada), but I'd like to know more - and I don't particularly trust wikipedia where legal matters are concerned. Any informed HNers care to comment?