Somehow it seems a violation of free speech to lock a man up for simply reporting something he observes, yet that is what happened in Pittsburgh according to this article in the Huffington Post.

A self-described New York City anarchist has been accused of tweeting the location of police officers to protesters trying to evade them during the Group of 20 economic summit in Pittsburgh.
Pennsylvania State Police arrested Elliot Madison alleging he used Twitter to direct the movement of protesters and inform them about law enforcement actions at last month’s summit.
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The charge is hindering prosecution. But is it hindering prosecution simply to report, which is ultimately all that was done?