By Emily Flitter NEW YORK (Reuters) - Prosecutors are considering charging Steven A. Cohen's SAC Capital Advisors as a criminal enterprise engaged in a long pattern of insider trading in stocks, according to a person familiar with the matter. Prosecutors may use the Racketeer Influenced and Corrupt Organizations Act, most commonly associated with prosecutions against the mafia, to move against Cohen's $15 billion hedge fund company, said the person, who spoke on condition of anonymity. While this is one option under consideration, no final decision has been made, the source added. ...