Hector Xavier Monsegur — known as "Sabu" — was arrested in 2011 on hacking charges.
He had faced a lengthy term, but instead agreed to work with US authorities to identify other hacking suspects.
The FBI said Monsegur had stopped more than 300 hacking attacks.
In a New York court, a judge sentenced him to seven months — which he has already served — and a year's supervision."
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