United States Department Of Justice

The United States Department of Justice (DOJ) is a Cabinet department in the United States government designed to enforce the law and defend the interests of the United States according to the law and to ensure fair and impartial administration of justice for all Americans. The United States Attorney General, one of the original members of the cabinet, administers the DOJ.
Duties of DOJ are:

• Responsible for investigating and prosecuting violations of federal laws.
• Represents the United States in all legal matters, including cases before the Supreme Court.
• Enforces all immigration laws, provides information, and processes applications for citizenship
• Maintains the federal prison system, halfway houses, and community programs.

Milton Bennett Medary completed the building in 1935 from a design. Upon Medary's death in 1929, the other partners of his Philadelphia firm Zantzinger Borie and Medary took over the project. On a lot bordered by Constitution and Pennsylvania Avenues and Ninth and Tenth Streets, Northwest, it holds over one million square feet of space. The sculptor C. Paul Jennewein served as overall design consultant for the entire building, contributing more than 50 separate sculptural elements inside and outside.
Various efforts, none entirely successful, have been made to determine the meaning of the Latin motto appearing on the Department of Justice seal, Qui Pro Domina Justitia Sequitur. It is not even known exactly when the original version of the DOJ seals itself was adopted, or when the motto first appeared on the seal. The most authoritative opinion of the DOJ suggests that the motto refers to the Attorney General (and thus to the Department of Justice) "who prosecutes on behalf of justice (or the Lady Justice)".
The building was renamed in honor of former Attorney General Robert F. Kennedy in 2001. It is sometimes referred to as "Main Justice."