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The US Department of Justice (DOJ) was formed on July 1, 1870 during the Ulysses S. Grant administration as an Executive Department of the US Government. It is the largest law enforcement agency in the country. DOJ has several several division, including:
Federal Bureau of Investigations (FBI)
US Marshals Service
Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF)
Drug Enforcement Agency (DEA)
Bureau of Prisons (BOP)
The DOJ is responsible for investigating instances of financial fraud as well as reviewing the conduct of local law enforcement as directed by the Violent Crime Control and Law Enforcement Act of 1994. DOJ represents the United States government in legal matters, such as cases before the Supreme Court, and running the federal prison system.
The department is managed by the United States Attorney General who is nominated by the President of the US, confirmed by the Senate and is a member of the Cabinet. The current Attorney General is William Barr, appointed by President Donald J. Trump.
This is a large topic, therefore, we encourage you to use the Wikipedia link below for complete details.