CBS sues majority owners to block Viacom merger

Shari Redstone. Photo by Jesse Grant/Getty Images.

CBS Corporation filed a lawsuit Monday against majority shareholder Shari Redstone for alleged breaches of fiduciary duty — an attempt to block her and her holding company from forcing a merger between CBS and its former sister company Viacom.

Why it matters: It's the latest twist in an already long and dramatic merger process. While both parties have denied that management complications have been holding up deal negotiations, this shows that control over the new company is essential to CBS leadership, and they're willing to fight to block a merger that doesn't give them such power.