Expect more insider-trading arrests.

That word comes as investors in Raj Rajaratnam’s Galleon Capital Group hedge fund scramble for the exits.

Bloomberg reports that sources say as many as 10 securities professionals, including hedge fund managers and their associates, could be swept up as early as this week. The sweep follows an investigation that has taken longer than two years.

Some of those planned arrests could be linked to the arrest of Rajaratnam, a billionaire known as the world’s richest Sri Lankan. Sources tell Bloomberg that authorities had originally planned to arrest Rajaratnam, the Galleon Capital boss whose bust has rocked Wall Street, this week. They moved their plans up and arrested him and five associates last Friday because the billionaire had bought a pair of plane tickets to London.

The Rajaratnam case was built on wiretaps of a web of conspirators, law enforcement has said. But probes have also grown from a Securities and Exchange Commission data-mining project aimed at finding clusters of people who make similar serendipitous trades.

The government calls the case against Rajaratnam the largest-ever hedge fund insider trading case, and stressed that it used methods like wiretaps more commonly used in cases against organized crime than white collar malfeasance in order to crack it. That, government officials have said, signals a new seriousness in the effort to police Wall Street.

That’s also the kind of detective work on the part of the government that should worry the entire hedge fund industry. Hedge fund managers of all types go to great lengths to gather information that could give them an edge in trading.

The New York Times reports that hedge fund managers canvass doctors in the hunt for blockbuster drugs, pay meteorologists to help gauge the price of oil or wheat, and hire corporate executives to gain insight into industries and companies.

All of that is legal.

The case against Rajaratnam is likely to hinge on whether he went too far in his quest for that edge. Prosecutors allege his firm pulled in as much as $18 million on insider trades.

As the drama of the criminal cases unfolds, another drama is taking place at the hedge fund Rajaratnam co-founded. Galleon, which once had $7 billion under management, had dropped to $3.7 billion in assets at the time of his arrest, and that number is dwindling fast.

The Wall Street Journal reports that investors have sought to withdraw about $1.3 billion from the hedge fund since Rajaratnam’s arrest last Friday. Two of the brokerage firms with which Galleon normally deals—Bank of America Merrill Lynch and Barclays PLC—have told Galleon they will no longer trade with the firm, a source tells the Journal.

Rajaratnam issued a short letter to investors, employees and friends vowing to fight the charges. “I am innocent and will vigorously defend myself and our firm,” he wrote. “As I move forward on my defense, I want to assure you that our commitment to our investors and employees will remain unwavering.”

Meanwhile, the ripple effects of the scandal have spread far beyond Wall Street.