Explain the "Angry Young Man Movement" in "Look Back in Anger."

Sure!  After World War II, there was a new phrase that
appeared that was originally coined by Leslie Allen Paul:  "angry young men." 
Basically, these were English men (usually of the working classes) who wrote for a
living; however, their writing had quite a few common traits:  anger, protest, and
rebellion of some sort.

Usually disillusioned with British
society, Jimmy of Look Back in Anger by John Osborne fits the
description of an "angry young man" perfectly.  In fact, anger is the main theme, of
course.  Jimmy is continually described as being both "helpless" and "angry."  Jimmy
always blames his friends and his society for his own failures.  He feels that, due to
his college education, he should have more going for him, but Jimmy doesn't and blames
it on everyone but himself.

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You see I learnt at an early age what it was to
be angry - angry and helpless. And I can never forget it. I knew more about - love...
betrayal... and death, when I was ten years old than you will probably ever know in your
life.

As a result of his own
failures, Jimmy is angry as he sells inexpensive candy at the market.  Another way that
Jimmy fits into the "angry young man" category is his hatred of Alison's relatives. 
Alison, of course, has upper-class roots.  Anyone in the "angry young man" movement, due
to their low social class, would be "required" to dislike anyone of upper-class
heritage.

In conclusion, it's important to note that it is
class conflict that defines the "Angry Young Man" movement.  Jimmy helps exemplify that
movement, therefore, the story Look Back in Anger by John Osborne
fits the bill perfectly.