Usually they trade their knowledge for money or power and no one notices --

But not always:

Insider-Trading Ring Bust May Fuel Hedge-Fund Concern
By David Scheer - March 2 2007

Prosecutors in New York and Washington yesterday brought criminal charges against 13 people claiming that an executive at UBS and a former compliance lawyer at Morgan Stanley tipped off hedge-fund traders and brokers to new analyst ratings and secret takeover talks. Bear Stearns was home to at least four professionals who traded on information leaked from inside the two firms according to a complaint filed by the Securities and Exchange Commission.

White Collar Crime is not any less heinous because they commit it with a Keyboard instead of a Handgun.  Yet more often than not in the Wild West of electronic casinos these criminals can make "a killing" without having to pull that trigger themselves ... without ever having to worry about ever facing their "day in court" ...
Through clever inventions like "naked short selling" or gigantic "put options" these modern day bandits can place their electronic bets and drive a company completely out of business in a matter of weeks.  It happens again and again as Hedge Funds place their Billions in Bets against a company succeeding -- and thus Leverage them right out of existence using 30 to 1 Margin calls.  

There are reasons WHY Hedge Funds (those Mutual Funds for Millionaires) fight "tooth and nail" to keep their Trade strategies from ever seeing the light of day ... (because often they are actually Betting against America succeeding! ...Hmmm? I wonder how many Hedgies the $400 Million Rush-man has his greasy mitts into?)

Bringing Down Bear Began as $1.7 Million of Options
By Gary Matsumoto - Aug 11 2008