Federal investigators are examining the practices of major retailers. Companies such as Walmart and Amazon are under scrutiny. The investigation focuses on beef prices and the meatpacking industry.

An expanded probe by the Department of Justice Antitrust Division named several large grocery store chains. Details about the investigation are available from the source.

The meatpacking industry was already under investigation, with companies controlling a significant portion of the processing market being examined. Some companies have already taken steps to settle lawsuits related to the issue.