Anthem logo The Anthem-Cigna deal's collapse set off a legal battle between the two insurance giants to collect billions of dollars from each other, providing an inside look at one of the largest busted corporate deals in U.S. history. (Photo: Diego M. Radzinschi/THE NATIONAL LAW JOURNAL)

(Bloomberg) –Cigna Corp.'s chief executive officer and board used "black-ops style" tactics in a covert campaign to "blow up" a $48 billion merger with rival insurer Anthem Inc., Cigna investors claim in a lawsuit.

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