U.S. attorney

United States Attorneys (also known as chief federal prosecutors and, historically, as United States District Attorneys) represent the United States federal government in United States district court and United States court of appeals.

The prosecution is the legal party responsible for presenting the case against an individual suspected of breaking the law, initiating and directing further criminal investigations, guiding and recommending the sentencing of offenders, and are the only attorneys allowed to participate in grand jury proceedings.

There are 93 U.S. Attorneys located throughout the United States, Puerto Rico, the U.S. Virgin Islands, Guam, and the Northern Mariana Islands. One U.S. Attorney is assigned to each of the judicial districts, with the exception of Guam and the Northern Mariana Islands where a single U.S. Attorney serves both districts. Each U.S. Attorney is the chief federal law enforcement officer within his or her particular jurisdiction, acting under the guidance of the United States Attorneys' Manual. They supervise district offices with as many as 350 Assistant U.S. Attorneys (AUSAs) and as many as 350 support personnel.

An Assistant U.S. Attorney (AUSA), or federal prosecutor, is a public official who represents the federal government on behalf of the U.S. Attorney (USA) in criminal prosecutions. In carrying out their duties, AUSAs have the authority to investigate persons, issue subpoenas, file formal criminal charges, plea bargain with defendants, and grant immunity to witnesses and accused criminals.

U.S. Attorneys and their offices are part of the Department of Justice. U.S. Attorneys receive oversight, supervision, and administrative support services through the Justice Department's Executive Office for United States Attorneys. Selected U.S. Attorneys participate in the Attorney General's Advisory Committee of United States Attorneys.