From the Document: "Over the past decade, Google, Amazon, Facebook, and Apple ('Big Tech' or the 'Big Four') have revolutionized the internet economy and affected the daily lives of billions of people worldwide. While these companies are responsible for momentous technological breakthroughs and massive wealth creation, they have also received scrutiny related to their privacy practices, dissemination of harmful content and misinformation, alleged political bias, and--as relevant here--potentially anticompetitive conduct. In June 2019, the Wall Street Journal reported that the Department of Justice (DOJ) and Federal Trade Commission (FTC)--the agencies responsible for enforcing the federal antitrust laws--agreed to divide responsibility over investigations of the Big Four's business practices. Under these agreements, the DOJ reportedly has authority over investigations of Google and Apple, while the FTC will look into Facebook and Amazon."
CRS Report for Congress, R45910
Congressional Research Service: https://crsreports.congress.gov/