obstruction of justice

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The criminal offense of intentionally hindering or interfering with the processes of law.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun law Intimidating or tampering with a witness or juror to influence their actions.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun impeding those who seek justice in a court (as by trying to influence or intimidate any juror or witness or officer of the court); can result in a finding of contempt of court