“ When a defendant has been subpoenaed to testify before a Grand Jury in an investigation, of which he is a primary target, has claimed his Constitutional privilege, advised the Grand Jury that he was doing so as an innocent man ensnared in suspicious circumstances and because he could not cross-examine or be represented by counsel, may the trial court charge the jury that they, may consider his refusal to testify before the Grand Jury on the score of his credibility, although his trial testimony was entirely consistent with his position before the Grand Jury? ”

“ Is not a defendant, particularly one who asserted that he was invoking the Fifth Amendment as an innocent man being plotted against and beset by suspicious circumstances entitled to have the jury charged, 'An innocent man may honestly claim his answers may tend to incriminate him'? ”

“ Whether a purpose to continue to conceal the accomplishment of the primary conspiracy may be inferred from the fact that the conspirators would be presumed to know that their activities would always be open to investigation-whether a subordinate conspiracy to conceal may be implied from the original crime. ”