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said Acts in the courts of the United States: PROVIDED, That no
person shall be prosecuted or be 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, in any proceeding, suit or prosecution under said
Acts: PROVIDED FURTHER, That no person so testifying shall be
exempt from prosecution or punishment for perjury committed in
so testifying (32 Statutes at Large, 904.)

Act of June 30, 1906, Chap. 3920.
Under the immunity provisions in the Act entitled „An Act in
relation to testimony before the Interstate Commerce Commission”
and so forth, approved February eleventh, eighteen hundred and
ninety-three, in section six of the Act entitled „An Act to establish
the Department of Commerce and Labor” approved February
fourteenth, nineteen hundred an three, and in the Act entitled
‚An Act to further regulate commerce with foreign nations and
among the States”, approved February nineteenth,- nineteen
hundred and three, and in the Act entitled „An Act making
appropriations for the legislative, executive, and judicial expenses
of the Government for the fiscal year ending June thirtieth, nineteen
 hundred and four, and for other purposes”, approved
Eebruary twenty-fifth, nineteen hundred and three, immunity shall
extend only to a natural person, who in obedience to a subpoena,
gives testimony under oath or produces evidence documentary Oor
otherwise, under oath. (34 Statutes at Large, 798).

‚ Act of March 3, 1913, Chap.. 114.
An Act Providing for Publicity in Taking Evidence under the
Act of July second, eighteen hundred and ninety.
In the taking of depositions of witnesses for use in any suit in
equity brought by the United States under the Act entitled „An
Act to protect trade and commerce against unlawful restraints
and monopolies” approved July second, eighteen hundred and
ninety, and in the hearings before any examiner or special master
appointed to take testimony therein, the proceedings shall be
open to the public as freely as are trials in open court: and no
order excluding the public from attendance on any such proceedings
shall be valid or enforceable. (37 Statutes at Large, 731).