Milgram conducted his experiments on obedience in the days before all research was scrutinized by an Institutional Review Board. Imagine, however, that Milgram had submitted his research proposal to an IRB of which you were a member.
What ethical issues would you raise as a member of the board? Would you have voted to approve Milgram's research?
In thinking about this question, keep in mind that no one expected participants to obey the researcher as strongly as they did (see Schlenker & Forsyth, 1977).