ed States, 485 U.S. 681 (1988) 254 In re Enter. Mort. Acceptance Co. Sec. Litig. ("Enterprise", ), 391 F.3d 401 (2d Cir. 2004) 36, 43, 44 In re Grand Jucv Subpoena Duces Tecum Dated Apr. 19, 1991, 945 F.2d 1221 (2d Cir. 1991) 108, 113 In re Grand Jury Subpoena Duces Tecum Dated Oct. 29, 1992, 1 F.3