The Federal Trade Commission on Wednesday urged a federal judge in DC to reject Facebook’s request to dismiss the FTC’s high-stakes antitrust lawsuit. In a 56-page legal brief, the FTC reiterated its arguments that Facebook’s profits have come from years of anticompetitive conduct.

“Facebook is one of the largest and most profitable companies in the history of the world,” the FTC wrote. “Facebook reaps massive profits from its [social networking] monopoly, not by offering a superior or more innovative product because it has, for nearly a decade, taken anticompetitive actions to neutralize, hinder, or deter would-be competitors.”

The FTC’s case against Facebook focuses on two blockbuster acquisitions that Facebook made early in the last decade. In 2012, Facebook paid $1 billion for the fast-growing startup Instagram. While Instagram the company was still tiny—it had only about a dozen employees at the time of the acquisition—it had millions of users and was growing rapidly. Mark Zuckerberg realized it could grow into a serious rival for Facebook, and the FTC alleges Zuckerberg bought the company to prevent that from happening.