Ackman Joins Fray to Pry Once-Worthless Fannie Mae From U.S.

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Bill Ackman and Bruce Berkowitz, two of the most successful investors of the past decade, aren’t afraid to go against the grain.

Ackman, a hedge-fund manager known for his detailed research, pushed U.S. mall owner General Growth Properties Inc. to file for bankruptcy, then helped orchestrate a rare victory for both bond and equity investors. Berkowitz scored big for his mutual funds by betting on American International Group Inc. at a time when the insurer’s future was in doubt.