ORLANDO, Fla. — Florida's new "anti-riot" law, championed by Florida lawmakers as a way to prevent violent protests, violates First Amendment rights.

That's according to a federal judge, who blocked HB 1 Thursday.

Chief Federal District Judge Mark Walker said the groups who brought the lawsuit demonstrated that the law chilled protest activities since it was enacted, because "the challenged law's confusing definition of 'riot' fails to give their members sufficient notice of what is prohibited or when they could be subject to arrest, such that their members do not wish to participate in future protests or have ceased organizing protests altogether."

The injunction blocking the law went into effect immediately.

This is a developing story. Check back for updates.