Hedge funds are playing the role of Wall Street villain again. This time, the charge is rampant insider trading. First came the 2009 arrest of Raj Rajaratnam, founder of the Galleon Group. Then came the November 22, 2010 raids of three hedge fund headquarters by FBI agents who seized documents and confiscated BlackBerries. Now authorities are serving subpoenas on other, larger hedge and mutual funds. Attorney General Eric Holder has announced the government’s widening investigation is “ongoing” and “very serious.” (Recently, though, Jesse Eisenger in the New York Times called these investigations a “side show.”)