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http://en.wikipedia.org/wiki/Snake_oil

"The snake oil peddler became a stock character in Western movies:
a travelling "doctor" with dubious credentials, selling some medicine
(such as snake oil) with boisterous marketing hype, often supported
by pseudo-scientific evidence, typically bogus. To enhance sales,
an accomplice in the crowd (a "shill") would often "attest" the
value of the product in an effort to provoke buying enthusiasm.
The "doctor" would prudently leave town before his customers realized
that they had been cheated. This practice is also called "grifting"
and its practitioners "grifters". "

HTH,
Paul