U.S. activist SOC Investment Group has urged shareholders of gaming giant Activision Blizzard to vote against the reelection of six directors for failing to recognize sexual harassment, sexual assault, and gender-based discrimination in the workplace at the upcoming June 21 annual meeting.

In a May 27 letter to shareholders, the activist pushed for a vote against CEO Robert Kotick, Chairman Brian Kelly, lead director Robert Morgado, Audit Committee Chair Robert Corti, Barry Meyer, and Peter Nolan.

The Californian Department of Fair Employment and Housing had been receiving reports from women facing routine workplace harassment, that women who reported harassment to human resources had their identities divulged to their harassers, and that at least one woman subject to such treatment committed suicide.

SOC Investment Group also condemned the company’s “deeply flawed governance,” stating that it has been clear for years that Activision’s board takes a deferential attitude towards executives, lacks effective leadership, and has fallen far behind current standards for best practices in corporate governance.

In a response letter made public Monday, Activision rejected SOC’s allegations and said it had a zero-tolerance harassment policy. The company also touted its efforts to improve diversity representation and pay equity.

The unusually high number of long-tenured executives is a cause for concern, according to SOC, with Kotick and Kelly serving on Activision’s board since 1991 and 1995 respectively, Morgado serving as a director since 1997, and Corti since 2003.

SOC said it was particularly concerned about Morgado’s influence, considering his long tenure and extensive influence as lead independent director, chair of the compensation committee, and chair of the nominating and corporate governance committee.

Defending Morgado, a former chairman and CEO of Warner Music Group, Activision said he brings extensive media and entertainment experience and “offers important perspectives necessary to ensure the company remains competitive.”

Activision’s stock price has dropped 19% down in the past year.