Controversial U.K. spy agency could serve as model for U.S. MI-5 long accused of abusing power, but it has lost some of secrecy 12/26/2002 By GREGORY KATZ / The Dallas Morning News LONDON - Britain's controversial domestic spy unit, MI-5, is emerging as a model for a possible U.S. agency that may be created to take over the FBI's role in the expanding fight against terrorism. U.S. lawmakers look to MI-5 - once so secret that even its director's identity was kept from the public - as proof that an internal spy unit can exist in a democracy without...