chief of the Department of Justice

Corey R. Amundson, chief of the Department of Justice’s Public Integrity Section, said the case was one of a string of recent corruption cases around the country, including in Ohio, Illinois and North Carolina, that involve businesspeople.

The decision to abandon the deal “highlights one of the possible implications of more aggressive enforcement” as Mr. Biden makes good on campaign promises to be tough on companies, said A. Douglas Melamed, a law professor at Stanford University and former acting chief of the Department of Justice’s antitrust division.

“It would be a hard sell to say a cop ought to do nothing if someone’s got a gun,” said Jonathan Smith, a former section chief of the Department of Justice’s Civil Rights Division who served as a consultant on the agreement between Illinois and the city of Chicago.

“It would be a hard sell to say a cop ought to do nothing if someone’s got a gun,” said Jonathan Smith, a former section chief of the Department of Justice’s Civil Rights Division who served as a consultant on the agreement between Illinois and the city of Chicago.

Target letters are used to inform a person that a grand jury is reviewing evidence that could be used to charge him or her with a crime, said Charles La Bella, a former federal prosecutor and former deputy chief of the Department of Justice’s fraud section.