Judge holds journalist in civil contempt for refusing to divulge source

Background information: Reporter&#x27;s privilege in the US <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Reporter%27s_privilege" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Reporter%27s_privilege</a><p>Internationally, United Nations, Council of Europe, and OSCE recognize journalists&#x27; right to protect their sources. The European Court of Human Rights has established source protection as essential component of freedom of expression in several cases.

Bit of discussion 6 hours ago [0] (19points, 7 comments) - this is the same text, different syndication.<p>[0]: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=39573032">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=39573032</a>

I&#x27;m a bit torn, it is complicated.<p>A government employee potentially illegally doxxed someone by giving their personal information to a journalist.<p>That someone wants to find out who it was using the only way they know how - asking the journalist who gave them the information.<p>Sources usually deserve protection, but if they were breaking the law and causing harm... is it warranted?<p>Not breaking the law like Snowden for the benefit of all, but to target a specific individual?

What is the law that requires divulging a source? How would that law be constitutional as per the first amendment?