Federal prosecutors say a former Florida professor accused of financing terrorism was briefly an FBI informant. The professor, Sami Al Arian, and three other men face a 50-count federal indictment that charges they used a charity in the United States to raise money for the Palestinian Islamic Jihad. Federal prosecutors revealed he was briefly an FBI informant after his lawyers attempted to get the government to hand over taped conversations between Al Arian and numerous Washington politicians including aides to the Bush and Clinton administrations.