d be asked about Derhowitz's involvement took the Fifth.29 This Isjilence is . . . evidence of the most persuasive character." United States ex rd. Biloktanskyl. Tod. 263 U.S. 149, 153-54 (1923) (Brandeis, J.), quoted in Baxter". Pahnigiano, 425 U.S 308, 319 (1976). And that silence takes on an even more si