Antitrust was a hot topic in 2020. Enforcement remained highly active, especially by the FTC, which filed more merger challenges than in any year since 2001. The DOJ and FTC continued to increase their focus on nascent competition, casting aside conventional practice to thwart firms' acquisitions of start-up competitors. Big Tech took center stage as lawsuits were filed, congressional hearings were held, and public debate raged over antitrust's role in addressing the rise of dynamic digital platforms. Here's a recap of the major events of 2020 and issues to watch for in 2021.