itness’ assertion of the Fifth Amendment privilege . . .” United States v. Custer Battles, L.L.C., 415 F. Supp. 2d 628, 632 (E.D. Va. 2006); accord Baxler v. Palmigiano, 425 U.S. 408, 318 (1976) (“the Fifth Amendment does not forbid adverse inferences against parties to civil actions when they refuse