Bill Ackman and Carl Icahn are back in the limelight. Where have we seen this before? Both legendary investors, Ackman and Icahn duked it out during Ackman's memorable activist short campaign against the dietary supplement and marketing company Herbalife.

Icahn took the long side of the bet, and the feud boiled over during an iconic debate on CNBC back in 2013 that saw the two take personal shots at each other.

Now, 10 years later, another battle between the two could be brewing. Icahn's conglomerate, Icahn Enterprises (NASDAQ: IEP), has come under attack from short sellers this year, and the stock has lost more than 57% of its value. Recently, Ackman made some comments about Icahn Enterprises on Twitter, which seem to be fanning the flames. 

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Source Fool.com