There's no monitoring. They all have the same rights as Canadians. However, they can't leave their jobs and look for another one like a Canadian would do. They are really tied to their employers. They don't have a choice; they have to continue working for that employer. They also can't speak the language and don't know their rights. They come from countries where those rights are not respected.
On March 31st, 2008. See this statement in context.