Replies

Congress has the authority to arrest and imprison those found in Contempt. The power extends throughout the United States and is an inherent power (does not depend upon legislated act)

If found in Contempt the person can be arrested under a warrant of the Speaker of the House of Representatives, by the Sergeant at Arms.

Joseph Story’s Commentaries on the Constitution, Volume 2, § 842
http://press-pubs.uchicago.edu/founders/print_documents/a1_5s21.html

Anderson v. Dunn - 19 U.S. 204 (1821)

“And, as to the distance to which the process might reach, it is very clear that there exists no reason for confining its operation to the limits of the District of Columbia; after passing those limits, we know no bounds that can be prescribed to its range but those of the United States.”

http://supreme.justia.com/cases/federal/us/19/204/case.html

Jurney v. MacCracken, 294 U.S. 125 (1935)
http://supreme.justia.com/cases/federal/us/294/125/case.html

73rd Cong., 78 Cong. Rec. 2410 (1934)
https://archive.org/details/congressionalrec78aunit

Rules of the House of Representatives

Rule IV Duties of the Sergeant at Arms

[] execute the commands of the House, and all processes issued by authority thereof, directed to him by the Speaker.

http://www.gpo.gov/fdsys/pkg/HMAN-105/pdf/HMAN-105-pg348.pdf