Joseph McKenna, Alexander v. United States (201 U.S. 117…
“ Testimony, at times, must be taken out of court. In instances like those in the case at bar the officer who takes the testimony, having no power to issue process, is given the aid of the clerk of a court of the United States; having no power to enforce obedience to the process or to command testimony, he is given the aid of the judge of the court whose clerk issued the process, and if there be disobedience of the process, or refusal to testify or to produce documents, such judge may 'proceed to enforce obedience . ”
