WikiLeaks founder Julian Assange to the United States, where he is wanted on an array of espionage charges.Ai, who has visited Assange regularly over the past few years both at the Ecuadorian Embassy in London until Assange's eviction last year and at Britain's Belmarsh high security prison since, said authorities have to protect the freedom of the press.“He is prepared to fight, but this is not fair to him," he said. “Free him, let him be a free man.”U.S.