I'd have thought that freedom of speech includes freedom to be silent. The same way freedom of worship includes freedom not to worship. (Maybe not an absolute absolute freedom, any more than freedom of speech is an absolute absolute - but you'd need a pretty good set of reasons to bulldoze it in any particular case, and this doesn't sound like such a case.)

That's one way this kind of thing sounds like offending against freedom of speech. And the other way is that once you get journalists compelled to reveal their sources and so forth, this closes down their ability to carry out certain kinds of investigative journalism. Maybe that's not so much a restriction on freedom of speech for the journalist as it is an attack on freedom of information for the public.

Another issue here is, what happened to "double jeopardy"? Apparently, if you get acquitted by a state trial, they can have another go at you and try you for the same offence in a federal trial.