http://www.cnbc.com/id/48874374 The New York attorney general is investigating whether some of the nationâs biggest private equity firms have abused a tax strategy in order to slice hundreds of millions of dollars from their tax bills, according to executives with direct knowledge of the inquiry. Alan Copson | Photographer's Choice RF | Getty Images The attorney general, Eric T. Schneiderman, has in recent weeks subpoenaed more than a dozen firms seeking documents that would reveal whether they converted certain management fees collected from their investors into fund investments, which are taxed at a far lower rate than ordinary income.