Aerojet Chairman Sues CEO Over Engine-Maker’s Board Battle (2)

Aerojet Rocketdyne Inc.’s chairman and three directors asked a judge to block the CEO and her allies on the board from using company resources in a fight for control of the rocket-engine maker.

A lawsuit unsealed Friday revealed long-simmering tensions between Chairman Warren Lichtenstein and Chief Executive Officer Eileen Drake who are at the heart of a proxy battle launched as U.S. antitrust regulators move to block Aerojet’s $4.4 billion takeover by Lockheed Martin Corp. The dispute has left the board split between warring factions.

The board fight surfaced as the unraveling merger complicates Lockheed’s efforts to develop ...