arrant for Law Offices, 153 F.R.D. 55 (S.D.N.Y.I 994) (criticizing "walling" in review of disputed attorney-client materials) with United States v. Noriegp 764 F.Supp. 1480 (S.D.Fla.1991) (finding no Sixth Amendment violation where the government agent reviewing monitored attorney-client conversations w