Need psychology help with Stanley Milgram (obedience experiment)

After reading this article answer the foll question

One of the most famous studies of obedience in psychology was carried out by Stanley Milgram (1963).

http://www.simplypsychology.org/milgram.html#ethical

What was the resolution of the ethical issue?

Ethical standards differ from those of today standards 

Was research invalidated or retracted?

Were people fined or jailed?

What happened to the participants in the study?

How that difference might have impacted the research in question: the

decision to do it then, the potential for it to be approved today, and etc.