"Former grey hat hacker Adrian Lamo has been revealed as a snitch and informant against Bradley Manning who is accused of leaking classified information to Wikileaks. In addition to embassy cables, he is accused of leaking the video that depicted an Apache Helicopter attack that claimed the lives of several journalists, civilians, and medical personnel in Iraq that was introduced to the world through the Collateral Murder website.
According to Lamo, Manning approached him and bragged that he was leaking classified information. "When Manning told Lamo that he leaked a quarter-million classified embassy cables, Lamo contacted the Army, and then met with Army CID investigators and the FBI at a Starbucks near his house in Carmichael, California, where he passed the agents a copy of the chat logs. At their second meeting with Lamo on May 27, FBI agents from the Oakland Field Office told the hacker that Manning had been arrested the day before in Iraq by Army CID investigators." (Wired.com)
Like many snitches, Lamo tries to justify his actions by saying that the information being leaked could have lead people into direct harm. This is contrary to Wikileak's "harm minimization policy" where they notify people who could be harmed by leaks of the risks before releasing documents. Like other snitches, Lamo failed to correctly assess that he was ruining the life of the person he ratted on.
According to the chat logs, Manning leaked classified documents with the sole intent to expose wrongdoing and diplomatic "scandal"."