From a recent Zerohedge blog post:
James Brigagliano, co-acting director of the SEC’s Division of Trading and Markets, said dark pools could impair price discovery by drawing valuable order flow away from the public quoting markets. “To the extent that desirable order flow is diverted from the public markets, it potentially could adversely affect the execution [...]

Regulators
We regulate any stealing of his property
And we damn good too
But you cant be any geek off the street,
Gotta be handy with the steel if you know what I mean, earn your keep!
Regulators!!! mount up!
The epic words of Warren G in many respects seem to sum up our government’s regulatory regime. [...]

Short sellers have been vulnerable to attack on the claim that they’re spreading rumors or are out to destroy a company. Companies have mounted public-relations campaigns against them. In a short sale, investors borrow shares and immediately sell them, hoping to profit by replacing them later at a lower price – a sell-high, buy-low strategy.
There [...]

On September 19, the United States Securities and Exchange Commission (SEC) abruptly banned short sales of financial stocks to protect companies that had come under siege in the stock market. There have been concerns that short sales are behind the big price slides in the market. Many felt that short sellers had contributed to the [...]

The Securities and Exchange Commission (SEC) was set up as a reaction to the stock market crash of 1929 to provide oversight of brokerage firms and protect investors. Last month, Morgan Stanley and Goldman Sachs Group, Inc., filed to become bank holding companies. Now with the sale of Bear Stearns, the bankruptcy of Lehman Brothers [...]