Journalists traditionally "go to jail" to protect the identity of a source in the face of a judge's request that the identity be revealed. Part of this derives from their ethical obligation to protect the anonymity of a source once they have promised to do so in order to gather information for a story. It's also done for practical reasons, as to disclose the identity would cripple their ability to collect information in that manner going forward.

I'm reluctant to see that as parallel to refusing to turn over evidence of a crime. For example, if a journalist had documents that are potentially incriminating of a third party, and a judge asked for them, I don't know the journalist would refuse.