Investors in Alphabet Inc.—the parent company of Google—have accused the Mountain View, California-based conglomerate’s board of fostering a culture of “rampant sexual harassment” and covering up misconduct by its senior male executives.

In a Chancery Court shareholder derivative complaint unsealed this week, four New York-based pension funds said corporate directors had failed to maintain internal controls at Alphabet, leading the company to abandon its own policies governing sexual harassment and misconduct and causing it to pay “tens of millions of dollars” to corporate executives who had been credibly accused.