The past year brought profound changes to antitrust enforcement, both in the United States and around the world. In the United States, President Biden's appointments to head the federal antitrust agencies have signaled a willingness to more aggressively enforce the antitrust laws. European regulators have also assessed the tech industry with record fines. Meanwhile, legal changes loom as Congress and the European Union debate a suite of new bills that could reshape antitrust enforcement. Here's a recap of the major events of 2021 and issues to watch for in 2022.