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contumacy or refusal to obey a subpoena issued to any corporation
 or other person, issue an order requiring such corporation
or other person to appear before the commission, or to produce
documentary evidence if so ordered, or to give evidence touching
the matter in question; and any failure to obey such order of
the court may be punished by such court as a contempt thereof.
 Upon the application of the Attorney-General of the United
States, at the request of the commission, the district courts of the
Ünited States shall have jurisdiction to issue writs of mandamus
commanding any person or corporation to comply with the provisions
 of this Act or any order of the commission made in pursuance
 thereof.
The commission may order testimony to be taken by deposition
in any proceeding or investigation pending under this Act at any
stage of such proceeding or investigation. Such depositions may
be taken before any person designated by the commission and
having power to administer oaths. Such testimony shall be reduced
to writing by the person taking the deposition, or under his
direction, and shall then be subscribed by the deponent. Any
person may be compelled to appear and depose and to produce
documentary evidence in the same manner as witnesses may be
compelled to appear and testify and produce documentary evidence
before the commission as herein before provided. Witnesses summoned
 before the commission shall be paid the same fees and
mileage that are paid witnesses in the courts of the United States,
and witnesses whose depositions are taken and the persons taking
the same shall severally be entitled to the same fees as are paid
for like services in the courts of the United States.
No person shall be excused from attending and testifying or
from producing documentary evidence before the commission or
in obedience to the subpoena of the commission on the ground
or for the reason that the testimony or evidence, documentary
or otherwise, required of him may tend to criminate him or subject
 him to a penalty or forfeiture. But no natural person shall
be prosecuted or subjected to any penalty or forfeiture for or on
account of any transaction, matter, or thing concerning which he
may testify, or produce evidence. documentary or otherwise,
before the commission in obedience to a subpoena issued by it;
PROVIDED, That no natural person so testifying shall be exempt from
prosecution and punishment for perjury committed in so testifying.