Ponzi Scheme Enforcement Actions
Curtailing Ponzi schemes and holding those responsible for these scams accountable is a vital component of the SEC's enforcement program.
Since fiscal year 2010, the SEC has brought more than 100 enforcement actions against nearly 200 individuals and 250 entities for carrying out Ponzi schemes.1 In these actions, more than 65 individuals have been barred from working in the securities industry. The SEC also has worked closely with the U.S. Department of Justice and other criminal authorities on parallel criminal and civil proceedings against Ponzi scheme operations.
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Source: http://www.sec.gov/spotlight/enf-actions-ponzi.shtml
Keep in mind that BTC or virtual money is just another asset class.