The original text of par. (2) contained a reference to the District Court of the United States for the District of Columbia. Act June 25, 1948, as amended by act May 24, 1949, substituted “United States District Court for the District of Columbia” for “District Court of the United States for the District of Columbia”. However, the words “United States District Court for the District of Columbia” have now been deleted entirely as superfluous in view of section 132(a) of Title 28, Judiciary and Judicial Procedure, which states that “There shall be in each judicial district a district court which shall be a court of record known as the United States District Court for the district”, and section 88 of Title 28 which states that “the District of Columbia constitutes one judicial district”.

1980—Par. (4). Pub. L. 96–245 inserted provisions authorizing service by certified mail.

1970—Par. (3). Pub. L. 91–452 struck out par. (3) which related to the immunity from prosecution of any individual compelled to testify or produce evidence after claiming his privilege against self-incrimination.

1947—Act June 23, 1947, restated section with addition of provisions requiring the issuance of subpenas as a matter of course on the request of any party.

Amendment by Pub. L. 91–452 effective on sixtieth day following Oct. 15, 1970, and not to affect any immunity to which any individual is entitled under this section by reason of any testimony given before sixtieth day following Oct. 15, 1970, see section 260 of Pub. L. 91–452, set out as an Effective Date; Savings Provisions note under section 6001 of Title 18, Crimes and Criminal Procedure.

For effective date of amendment by act June 23, 1947, see section 104 of act June 23, 1947, set out as a note under section 151 of this title.