How is the Stanford Prison Experiment connected to Conformity? I am still not very clear with what the Stanford Prison Experiment conducted by Zimbardo was trying to conclude about from the experiment.

From Wikipedia, it says the conclusion was to:


  demonstrate the impressionability and obedience of people when
  provided with a legitimizing ideology and social and institutional
  support. The experiment has also been used to illustrate cognitive
  dissonance theory and the power of authority.


How does this have any relation or impact on the Conformity theory? 

I know that the experiments by Sherif and Asch have concluded the theory of Conformity quite clearly. The Zimbardo's one however seems somewhat implicit. The notes that I read seem to put the Stanford Prison experiment right after the ones by Sherif and Asch. So I believe it should have some relation with the Conformity theory. But I cannot see clearly how is it related to the Conformity theory, particularly in the context of Communications.
Zimbardo himself states that both informative and normative conformity played an important role in the Stanford Prison Experiment.


  Source: http://www.lucifereffect.com/guide_conform.htm
  
  [...] Informative conformity often occurs in situations in which there is high uncertainty and ambiguity. In an unfamiliar situation, we are likely to shape our behavior to match that of others. The actions of others inform us of the customs and accepted practices in a situation. Others inform us of what is right to do, how to behave in new situations.
  
  In addition to conforming to the group norms due to lack of knowledge, we also conform when we want to be liked by the group. This type of conformity, called normative conformity, is the dominant form of social conformity when we are concerned about making a good impression in front of a group. Though we may disagree secretly with the group opinion, we may verbally adopt the group stance so that we seem like a team player rather than a deviant.
  
  Both of these pressures impact us everyday, for good or for worse. [...]
  Similarly, in the Stanford Prison Experiment, the subjects who were randomly assigned as guards gradually adopted the behavior of cruel and demanding prison guards because that became the behavioral norm in an alien situation.