A. Whether the Fifth or Sixth Amendments, or Rules 43 and 44 of the Federal Rules of Criminal Procedure, are violated when neither a criminal defendant nor his counsel is present at the hearing at which prejudicial evidence is admitted.

B. Whether the Government's suppression of information that included co-conspirators' statements impeaching a cooperating witness and casting doubt on the Government's theory that a murder was in furtherance of the conspiracy violated petitioners' due process rights under Brady v. Maryland, 373 U.S. 83 (1963).

Whether the Fifth or Sixth Amendments, or Rules 43 and 44 of the Federal Rules of Criminal Procedure, are violated