Julian Assange has urged the US to end its "witch-hunt" against Wikileaks in his first public statement since entering Ecuador's London embassy.
He also called for the release of Bradley Manning, who is awaiting trial in the US accused of leaking classified documents to the Wikileaks site.
Mr Assange spoke from a balcony at the embassy and thanked Ecuador's president, who has granted him asylum.
He faces extradition to Sweden over sexual assault claims, which he denies.
The 41-year-old said the United States must also stop its "war on whistleblowers".
He added: "The United States must vow that it will not seek to prosecute our staff or our supporters.
"The United States must pledge before the world that it will not pursue journalists for shining a light on the secret crimes of the powerful.
Mr Assange also said the United States was facing a choice between re-affirming the "revolutionary values it was founded on" or "dragging us all into a dangerous and oppressive world in which journalists fall silent under the fear of prosecution and citizens must whisper in the dark".