Barrett Brown is an American Journalist & essayist.
Barrett challenged & exposed the US Government over cybersecurity, privacy & democracy rights, the intelligence industry etc.
As it says on Wikipedia: In January 2015, Brown was sentenced to 63 months in federal prison for the crimes of accessory after the fact, obstruction of justice, and threatening a federal officer stemming from the FBI's investigation into the 2012 Stratfor email leak.
Please read his latest posting for The Intercept, I think it's quite extraordinary.
https://theintercept.com/2016/02/02/barrett-brown-the-rule-of-law-enforcement/