In Brazil interns are supposed to be sort of apprentices, not people you are testing to see if you will hire them. For example unpaid internships are illegal,

In Brazil interns are supposed to be sort of apprentices, not people you are testing to see if you will hire them. For example unpaid internships are illegal, and although they don't get much benefits, their mininum wage per hour is higher (Brazillian law says mininum wage is monthly, but limits the number of hours a intern can work in a month, so interns hourly wage is higher). Also it was not business critial work, it was work that we could let the intern do and fail and whatnot, the problem is that the intern was so bad it disrupted the work of people doing business critical work.