Since many people are asking for more facts and concrete evidence I would like to direct you to some other sites that may be helpful.
This is a link to a story that actually aired on television not too long ago. A news reporter from NBC Dateline went undercover on a year long investigation with Quixtar. This is a video eveyone should watch:
http://video.google.com/videoplaydocid=-215989802739458876&q=quixtar
This Website actually provides actual documents from Quixtar cases and the people involved. There is also other helpful information about Quixtar that I have not been able to include in this petition:
http://www.cs.cmu.edu/~dst/Amway/
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