Most recently, Mr. Icahn sought to buy Mylan Laboratories in an effort to block its acquisition of King Pharmaceuticals.

U S West sued, seeking to block Time Warner's planned $7.5 billion acquisition of Turner Broadcasting.

Also that year, the Justice Department successfully sued to block Microsoft's planned acquisition of Intuit Inc., the maker of personal finance software.

The Delaware Chancery Court is expected to rule by tomorrow on Paramount's suit seeking to block Time's acquisition of Warner.

It is appealing a decision by the Kansas insurance commissioner that threatens to block its acquisition of the Kansas Blue Cross/Blue Shield plan.

The European Commission is widely expected to use antitrust concerns to block Volvo's $7.4 billion acquisition of Scania, Sweden's other big truck maker.

The Justice Department warned TBG that it intended to file a civil suit to block its proposed $127 million acquisition of Chase Brass.

On March 23, the Government filed to block Lockheed's acquisition of Northrop on the ground it would hurt competition among military contractors.

It moved to block Venezuela's acquisition of military aircraft from Spain and Brazil by denying export licenses for the transfer of American-made components for the planes.

General Electric is planning to appeal the European Commission's decision to block its acquisition of Honeywell International, executives close to the company said yesterday.