Re: How about ...
From the Wikipedia entry for Lamo:
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In May 2010, Lamo reported to U.S. Army authorities that Chelsea Manning, then Bradley Manning, had claimed to have leaked a large body of classified documents, including 260,000 classified United States diplomatic cables.
Lamo stated, in an article written by Kevin Poulsen in Wired magazine, that he would not have turned Manning in "if lives weren't in danger ...
WikiLeaks responded by denouncing Lamo and Poulsen as "notorious felons, informers & manipulators", and said: "journalists should take care."
According to Andy Greenberg of Forbes, Lamo was a volunteer "adversary characterization" analyst for Project Vigilant, a Florida-based semi-secret government contractor, which encouraged him to inform the government about the alleged WikiLeaks source. The head of Project Vigilant, Chet Uber, claimed, "I'm the one who called the U.S. government ... All the people who say that Adrian is a narc, he did a patriotic thing. He sees all kinds of hacks, and he was seriously worried about people dying.
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I think Assange is a narcissistic cockwomble of the first order but he did not turn Manning in. Sorry if this goes against your established belief