Facebook investors pushed back Tuesday against Facebook directors’ motion to dismiss a proposed derivative class action in Delaware stemming from the company’s Cambridge Analytica scandal, arguing that the board ignored “warning flag after warning flag” that led to a massive breach of user data.

In a Chancery Court filing made public Monday, plaintiffs argued that deep conflicts on Facebook exposed the Facebook directors to serious liability for their role in allegedly hiding from users, investors—and the U.S. Congress—Facebook’s practice of sharing private data with outside parties.