The arrest of Julian Assange presages a free-speech debate that we've been avoiding for the seven years he was living in the Ecuadorian Embassy in London. To wit: Can Assange be lawfully prosecuted for somehow facilitating illegal theft of classified information? Or is the organization he founded, WikiLeaks, protected by the First Amendment when it publishes documents supplied by others, as the New York Times was when it published the Pentagon Papers?
Current law is not especially clear on this question. The actual 1971 Pentagon Papers case, New York Times vs. United States, wasn't about punishing the Times after the fact. It was about the distinct (albeit related) question of whether the government could block the publication of classified material before it hit the newsstands — what First Amendment lawyers call "prior restraint."
The Supreme Court's answer was no, the government can't block a newspaper from publishing classified material that it has received without committing any legal wrong on its own.
The right to publish, however, leaves open the possibility of prosecuting anyone who actively violates national security law by disclosing classified information — in other words, punishing the leaker. It's on this logic that Chelsea Manning, a former U.S. Army analyst, was convicted and imprisoned in 2013 for leaking classified military files and diplomatic cables to WikiLeaks. (Her sentence was commuted by President Barack Obama before he left office in 2017.)
And no one doubts that Edward Snowden — the former National Security Agency contractor who gave secret documents to WikiLeaks before escaping to Russia — could be convicted in U.S. court if he were captured.
The difficult question lies in between: What about a person or institution that in some way coordinates with the initial leaker? Under ordinary criminal law, someone who aids and abets a felony can be charged with a crime. Arguably, someone who coordinates with a leaker to publish unlawfully leaked information could be subject to criminal penalties.
That's the crime the government says Assange committed. The Department of Justice said Thursday that Assange helped Manning crack a password while she was taking information from government servers. If the government can prove that, it looks like a genuine crime.
Mere encouragement is a closer call. The government may say a jury should decide if this is aiding and abetting in the form of encouragement. That's worrisome. Some forms of encouragement would count as aiding and abetting, but the government should be especially cautious about charging that when free-speech rights are in question.