How does the family's faith in the American Dream begin to shatter at this point in the novel?

This question is covered in detail in Gradesaver's summary and analysis. I have provided the direct link below.

http://www.gradesaver.com/the-jungle/study-guide/summary-chapters-5-7

Dede Atanas loses his job.

Jurgis found that workers who spied were rewarded above those who supplied hard work and loyalty.

That man who had been sent to Jurgis’ father by the boss, he would rise; the man who told tales and spied upon his fellows would rise; but the man who minded his own business and did his work— why, they would "speed him up" till they had worn him out, and then they would throw him into the gutter.