The F.B.I. had help from an unlikely source when it caught up with Army intelligence officer Bradley Manning, the alleged source of the WikiLeaks "Collateral Murder" video. Former hacker Adrian Lamo, 29, who notoriously broke into The New York Times computer system in 2002, tipped off authorities after Manning, 22, allegedly contacted him to brag about providing the controversial combat video and 260,000 classified diplomatic cables to WikiLeaks, a whistle-blower website. Some in the hacker community have bombarded Lamo with death threats for reporting Manning, but others have heralded him as a national "hero." How did Lamo become such an integral part of the WikiLeaks scandal?

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