" Sec. and Exch. Comm'n v. Dresser Indus., 628 F.2d 1368, 1382 (D.C. Cir. 1980) (en banc). Here, the FBI properly witheld the grand jury subpoenas. Lopez v. Dep't of Justice, 393 F.3d 1345, 1350 (D.C. Cir. 2005) ("All grand jury subpoenas ... fall within FOIA's third exemption."). The records relating the gra