President Bush... ordered changes intended to break down old walls between foreign and domestic intelligence activities by creating a new national security division within the Federal Bureau of Investigation that will fall under the overall direction of John D. Negroponte, the new director of national intelligence. The directive by Mr. Bush is aimed at consolidating the power of Mr. Negroponte, whose authority over the F.B.I. had been ambiguous. It also sets in motion a major restructuring designed to dissolve the barriers that have often kept the Central Intelligence Agency and the F.B.I. at arm's length, and elevates intelligence operations to...