Assange appeals 'invalid' warrant at Supreme Court
Julian Paul Assange - Australian publisher and journalist, best known as the editor-in-chief of the whistleblower website WikiLeaks, which he co-founded in 2006 (photo and info Wikipedia)

Wikileaks founder Julian Assange is appealing his extradition to Sweden at the Supreme Court, arguing the arrest warrant is "invalid and unenforceable". What is he accused of? Is he guilty?

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Whistleblower - someone who reports dishonest or illegal activities within an organization to someone in authority (Macmillan Dictionary)