The new federal whistleblower law is proving a hot item for many plaintiff law firms. Attorneys say that tipsters with visions of becoming millionaires are flooding their offices with calls.

“In the last three weeks, I’ve had many, many more whistleblowing calls than I had in the last three years,” said Rebecca Katz, a partner at Bernstein Liebhard in New York. Katz is a former senior counsel in the enforcement division of the Securities and Exchange Commission, where she served from 1990 to 1998.