Judge Richard Posner Calls For "A Domestic CIA"

Judge Richard Posner calls for a domestic spying operation inside the United States:

The objections to creating a U.S. counterpart to MI5 are shallow. The FBI notes that Britain has only about 50 police forces and the U.S. 18,000: How could a U.S. domestic intelligence agency staff 18,000 field offices? It couldn't, of course. But neither can the FBI, which has only 56 field offices and an attitude of hauteur toward local police. Some fear that a domestic intelligence agency would be a secret police, spying on Americans. But like MI5 (and its Canadian counterpart, the Canadian Security Intelligence Service), such an agency would have no powers of arrest, and no greater authority to "spy on Americans" than the FBI now does.

Judge Posner the radical libertarian? It appears that Judge Posner is a big government man at heart.