Subpoenas may be issued only under the signature of the Chairperson or any member of the Board designated by him and shall be served by any person designated by the Chairperson, any member, or any person as otherwise provided by law. The attendance of witnesses and the production of evidence may be required from any place in the United States at any designated place of hearing in the United States.

Any member of the Board may administer oaths or affirmations to witnesses appearing before the Board.

If a person issued a subpoena under paragraph (1) refuses to obey such subpoena or is guilty of contumacy, any court of the United States within the judicial district within which the hearing is conducted or within the judicial district within which such person is found or resides or transacts business may (upon application by the Board) order such person to appear before the Board to produce evidence or to give testimony relating to the matter under investigation. Any failure to obey such order of the court may be punished by such court as a contempt of the court.

The subpoenas of the Board shall be served in the manner provided for subpoenas issued by a United States district court under the Federal Rules of Civil Procedure for the United States district courts.

All process of any court to which application may be made under this section may be served in the judicial district in which the person required to be served resides or may be found.