Differences between common crimes and white-collar crimes.

This discussion forum explores one of the most significant white-collar crimes in U.S. history, the Bernard Madoff “Ponzi Scheme.” 
the requirement in this assignment: 
Research the Bernard Madoff “Ponzi Scheme” scandal and respond to the questions below in a short (2+ paragraphs) response that you post to the discussion board. 
What are the facts regarding this scandal? How could such a scheme occur? Has justice been served in this case? Should white-collar crimes be prosecuted as aggressively as common crimes?