The Bell System was a system of telecommunication companies, led by the Bell Telephone Company and later by the American Telephone and Telegraph Company (AT&T), that dominated the telephone services industry in North America for over one hundred years from its creation in 1877 until its antitrust breakup in 1983. The system of companies was often colloquially called Ma Bell (as in "Mother Bell"), as it held a vertical monopoly over telecommunication products and services in most areas of the United States and Canada. At the time of the breakup of the Bell System in the early 1980s, it had assets of $150 billion (equivalent to $390 billion in 2021) and employed over one million people.

Ever since the 1910s, American antitrust regulators had been observing and accusing the Bell System of abusing its monopoly power, and had brought legal action multiple times over the decades, until in 1974 the Antitrust Division of the U.S. Department of Justice brought a lawsuit against Bell claiming violations of the Sherman Act. In 1982, anticipating that it could not win, AT&T agreed to a Justice Department-mandated consent decree that settled the lawsuit and ordered it to break itself up into seven "Regional Bell Operating Companies" (known as "The Baby Bells"). This ended the existence of the conglomerate in 1984. These Baby Bells became independent companies and several of them are today very large corporations in their own right.

The United States Department of Justice (DOJ), also known as the Justice Department, is a federal executive department of the United States government tasked with the enforcement of federal law and administration of justice in the United States. It is equivalent to the justice or interior ministries of other countries. The department is headed by the U.S. Attorney General, who reports directly to the president of the United States and is a member of the president's Cabinet. The current attorney general is Merrick Garland, who was sworn on March 11, 2021.The modern incarnation of the department was formed in 1870 during the Ulysses S. Grant presidency. The department is composed of federal law enforcement agencies, including the U.S. Marshals Service, the Federal Bureau of Investigation, the Bureau of Alcohol, Tobacco, Firearms and Explosives, and the Drug Enforcement Administration and the Federal Bureau of Prisons. The primary actions of the DOJ are investigating instances of white collar crime, representing the U.S. government in legal matters (such as in cases before the Supreme Court), and running the federal prison system. The department is also responsible for reviewing the conduct of local law enforcement as directed by the Violent Crime Control and Law Enforcement Act of 1994.